LogicWiz Blog

Engineering deep-dives and practical guides on DSA, Generative AI, assessments, and technical hiring from the LogicWiz team.

• What LLM Temperature Does to an Answer, Worked Out by Hand

  2026-10-21

  Temperature divides a model's scores before they become probabilities. A five-word example, calculated by hand and in a short Python script, shows why low values repeat themselves and high values wander.

• How to Do Item Analysis on an MCQ Test: Difficulty, Discrimination and Distractors

  2026-10-21

  After a test, the score list tells you about students. Item analysis tells you about the questions. Three numbers per question, worked through with a small example, find the items that need a second look before the next batch.

• Technical Interview Follow-Up Questions: A Five-Step Ladder for Telling Rehearsed From Real

  2026-10-21

  A first answer tells you what a candidate has read. The follow-ups tell you what they have done. Five probes, in a fixed order, with example wording and what each answer should sound like.

• Valid Anagram in Python: Three Solutions and the Follow-Up Question That Catches People

  2026-10-21

  Three working Python solutions to Valid Anagram (sort, Counter, a 26-slot array), their time and space costs, and a negative-index bug in the array version that returns True for strings that are not anagrams.

• Build an AI Agent in Python From Scratch, No Framework (Tool Calling Loop)

  2026-10-17

  Build an AI agent in Python with no framework: three tools, a max-steps guard, memory and error handling. Runs offline, then the OpenAI function-calling version.

• How to Pass ATS With Your Resume: An ATS-Friendly Resume Checklist

  2026-10-17

  What an ATS is and how to pass it: a resume checklist covering file format, headings, keywords, tables, dates and contact details, separating sources from common advice.

• How to Prepare for an AI Interview: Tips for Answering an AI Interviewer

  2026-10-17

  How to prepare for an AI interview: what an AI interviewer can and cannot do, a 7-day practice plan, voice versus text, follow-ups, and what to ask about privacy.

• RAG Tutorial in Python, Build a Retrieval-Augmented Generation Pipeline From Scratch

  2026-10-17

  A RAG tutorial in Python you can run offline with no API key, then swap in a real embedding model and LLM. Covers chunking, top-k, a tiny eval and debugging.

• RAG vs Fine-Tuning, and When to Use Each

  2026-10-17

  Use RAG when the model lacks facts and fine-tuning when it knows enough but behaves wrong. A comparison table, a checklist and two worked examples.

• How to Fix SQLite "Misuse of Aggregate: count()" (SQL Logic Error 1)

  2026-10-17

  What SQLite's "misuse of aggregate: count()" error means, the five queries that cause it, and the fixed version of each, all run in SQLite 3.54.

• STAR Method Examples for Software Engineers: 8 Behavioral Interview Questions With Worked Answers

  2026-10-17

  Eight behavioral interview questions for software engineers, each with a worked STAR answer, what interviewers listen for, and the mistake that sinks it.

• How to Learn to Build AI Agents From Zero, a 2026 Roadmap for Beginners

  2026-10-16

  A staged roadmap from never having coded to building AI agents, with what to learn, what to build and how to know you are ready at each stage.

• AI Fluency Interview Questions: A Round You Can Score

  2026-10-14

  Four kinds of AI fluency interview question for engineers, a worked planted-mistake example, and a copyable 0 to 3 rubric for consistent scoring.

• Do You Need an OpenAI API Key to Learn Generative AI?

  2026-10-14

  Not to start. What you can learn with no key, when one becomes necessary, free alternatives like local models and free tiers, and how to keep a key safe.

• How to Answer "Do You Use AI at Work?" in an Interview, and How to Practise Spotting AI Mistakes

  2026-10-14

  Say yes if you do, name the tool and the task, and spend most of the answer on how you checked the output. Sample answers and free ways to practise.

• How to Check if a Course Certificate Is Real, for Recruiters and Students

  2026-10-14

  Open the issuer's own verification page and match the details. A step-by-step check, what a QR code proves, look-alike pages and India's DigiLocker route.

• Is a Free GenAI Certificate Worth It for Freshers? What Recruiters Can Check

  2026-10-14

  It can get your CV past a keyword screen, and the interview does the rest. Which free GenAI certificates are proctored, which can be checked, and what to add.

• How to Mark Handwritten Answers in an Online Test, Step by Step

  2026-10-14

  Students photograph each page with a phone and attach it to the question; a teacher marks it against a rubric. The full workflow, step by step.

• Testpress, Classplus and ParikshaDesk Alternatives for Online Tests, by Institute Size

  2026-10-14

  Which online test tool fits a 50-student tutor, a 300-student institute or a college? Testpress, Classplus, ParikshaDesk and more, from their own pages.

• TCS NQT Pattern 2026: What Every Source Agrees On, and Where They Differ

  2026-10-14

  TCS NQT Foundation is settled: 65 questions, three 25-minute clocks, no negative marking. The Advanced section isn't. Five prep sites compared.

• How to Practise Spotting an AI's Wrong Answer Before Your Interview

  2026-10-11

  Some interviews now give you a confident AI answer with one wrong line and ask you to find it. A method that works, two worked examples, and free ways to practise.

• Is the LogicWiz GenAI Course Really Free? What Costs Nothing and What Doesn't

  2026-10-11

  Yes, every lesson is free, with no card. Here is exactly what needs an account, and the two optional things that are separate.

• Learn Python for AI in Your Browser, With No Install and No GPU

  2026-10-11

  You can learn the Python you need for AI agents without setting up anything on your laptop. What a browser lab looks like, and what the first lesson covers.

• Free AI Agents Courses in 2026, Compared by Framework and Prerequisites

  2026-10-08

  Hugging Face, DeepLearning.AI, Microsoft, LangChain Academy, Anthropic, freeCodeCamp, Analytics Vidhya, Google and LogicWiz, read from their own pages in October 2026. Which framework each one teaches, what you need first, what is really free, and how to choose.

• Free Coding Quiz Games for College Students in India (2026), Compared Honestly

  2026-10-07

  Unstop, Internshala, CodeChef, LeetCode, Code360, Codeforces, Underrated Coder, LearnFullStack, company hackathons and LogicWiz's Spot Aria's Mistake, checked against their own pages. What is free, what format, whether you read or write code, and who each one suits.

• How to Reduce Cheating in Online Tests: What Proctoring Can and Cannot Do

  2026-10-07

  A practical guide for coaching institutes and training academies. What each anti-cheating control catches, what it misses, how to avoid false accusations, and which settings to switch on first.

• 8 SQL Interview Answers That Sound Right and Are Wrong

  2026-10-07

  Eight SQL answers about NULL, joins, HAVING and dates that freshers give with full confidence, why each one is wrong, what to say instead, and a small test you can run yourself to prove it.

• How to Test Whether Candidates Can Spot Mistakes in AI-Generated Answers (an Interview Round You Can Run)

  2026-10-07

  A ten-minute interview round for checking whether a candidate can catch the one wrong line in a confident AI answer. Includes a worked example, a scorecard, common interviewer mistakes, and what HackerRank, Codility, CoderPad, CodeSignal and others say about assessing AI output.

• Can You Spot the AI's Mistake? A Free 5-Minute Coding Game

  2026-10-04

  An AI writes a confident five-line answer and one line is wrong. Find it, say why, and beat the clock. Try a sample round right here, then play the free Spot Aria's Mistake game on the track you pick, from Python and SQL to AI and DSA.

• Best Free GenAI Courses in 2026, Compared Honestly

  2026-10-02

  Hugging Face, Microsoft, DeepLearning.AI, Anthropic, Google and Kaggle, DataTalks.Club, AgentSwarms and LogicWiz, checked against their own pages. What each one teaches, what is actually free, what you need before you start, and who should skip it.

• Free AI Mock Interview Platforms for Freshers in India, Compared Honestly

  2026-10-02

  AceInterview, Sansal, Cloudvyn, HireStepX, MockMind, GoodSpace, Huru, interviewing.io, Aced, Final Round AI and LogicWiz Interviews, checked against their own pages in October 2026. What is actually free, which ones handle technical rounds, voice or text, and which are built for Indian campus and IT-services interviews.

• Free Ways to Learn and Practise DSA, Compared Honestly

  2026-10-02

  LeetCode, NeetCode, VisuAlgo, the USFCA visualizations and LogicWiz, checked against their own pages. What is free, what needs a paid plan, which ones teach and which ones only test, and how to combine them.

• How to Make Your Institute's Certificates Verifiable, and Why Employers Check

  2026-10-02

  Your certificates get read years later by people who cannot easily reach you. How certificate verification works, the four ways institutes do it, what a hash actually proves, and a checklist for whatever system you use.

• A Technical Interview Scorecard Template That Interviewers Actually Fill In

  2026-10-02

  A copyable scorecard for engineering interviews, with four competencies, behavioural anchors for each score, and three rules for using it. It runs fine in a spreadsheet.

• GenAI Interview Questions for Freshers: 10 Answers That Sound Right and Are Wrong

  2026-10-01

  Ten GenAI interview questions where the confident textbook answer is the one that fails. Each comes with what the answer gets wrong, why it matters in real work, and what to say instead.

• What MCP Is Actually For, and When You Don't Need It

  2026-09-30

  Three agents and four tools is twelve integrations you maintain. MCP turns that multiplication into an addition. What actually travels over the wire, why the tool description does the job of an interface, and the latency budget that makes MCP the wrong choice.

• Why Language Models Invent Sources, and What Actually Stops It

  2026-09-29

  A New York lawyer filed six court cases that did not exist. The model was working as designed when it made them up. What next-token prediction actually does, why asking the model to double check cannot work, and what retrieval changes.

• Why Video Courses Don't Stick for DSA and Generative AI

  2026-09-09

  Watching someone code feels like progress and rarely transfers. What the research says about video versus visual, self-paced practice, and how the LogicWiz DSA and Generative AI courses are built around it.

• What "Hands-On" Actually Means in a Free Generative AI Course

  2026-09-01

  Free" and "hands-on" are the two most overused words in AI course marketing. A checklist for telling them apart from the real thing, and what LogicWiz's free Generative AI course actually includes against it.

• How to Run a Hiring Debrief That Isn't Decided by the Loudest Person

  2026-08-25

  The debrief is where most hiring decisions are actually made, and where most of them go wrong. A practical guide to running one where disagreement gets aired and discussed.

• What "White-Label" Actually Means for a Coaching Institute Exam Platform

  2026-08-25

  Most exam platforms claim white-labelling and mean four different things by it. A checklist for working out what you're actually buying before your students see someone else's logo.

• Best AI Interview Platforms for Startups in India (2026)

  2026-08-18

  Six AI interview platforms compared for small engineering teams, what each actually solves, what it costs in India, and how to tell which bottleneck you have before you buy anything.

• Best Online Exam Software for Coaching Institutes in India (2026)

  2026-08-18

  An honest comparison of six online exam platforms used by Indian coaching institutes, plus nine others worth knowing, what each says it does, who it suits, and how to choose without a three-month evaluation.

• Generative AI vs AI Agents vs Agentic AI: What's the Difference?

  2026-05-14

  Generative AI answers a prompt. An AI agent adds tools. Agentic AI coordinates several agents on a multi-step job. Plain definitions of each, the architecture behind them, and how to decide which one your project needs.

• GenAI, and Why It Actually Matters

  2026-05-12

  A grounded look at what Generative AI actually does well today, where it still falls short, and the workflows where it already pays off.