Quick answers
Short answers to questions we are asked often, about learning Generative AI, checking certificates, running online exams, preparing for placements and technical interviews. Each answer links to a longer guide with the detail and sources.
For step-by-step plans, see the placement and interview preparation guides.
Learning Generative AI
Is the LogicWiz GenAI course free?
Yes. The course is completely free with no card: the early chapters open without an account and later chapters need a free account, and the certification exam is free too.
Which free GenAI courses are worth taking?
It depends on where you start: Hugging Face, Microsoft, DeepLearning.AI, Google and others each teach different things and expect different prerequisites. Compare what each one teaches, what is really free and what you need first before you commit.
Is there a free AI agents course that covers MCP?
Yes, several free courses cover agents, and they differ by framework (LangGraph, smolagents, AutoGen and others) and by how much Python they expect. The LogicWiz GenAI course starts from basic Python and ends with MCP tools for the assistant you build.
How do I learn to build AI agents from zero?
Learn basic Python first, then call a language model from code and give it tools in a loop, then add retrieval over your own documents, and only then move to multi-agent frameworks and protocols like MCP. Build something at each stage before moving on.
Should I use RAG or fine-tuning?
Use RAG when the model is missing facts, such as your own documents, and fine-tuning when it has the facts but answers in the wrong format or style. Try better prompting first, then RAG, and fine-tune only after you have evals.
How do I build a RAG pipeline in Python from scratch?
Split your documents into overlapping chunks, turn each chunk into a vector, store them, retrieve the top few chunks closest to the question, and pass those to the model inside the prompt. A small evaluation set tells you whether retrieval or generation is failing.
How do I build an AI agent in Python without a framework?
Write a loop where the model picks a tool, your code runs it, and the result goes back into the conversation until the model gives a final answer. Add a maximum number of steps and handle bad tool calls so the loop cannot run forever.
Can I learn Python for AI without installing anything?
Yes. A browser lab gives you a code editor, a Run button and an expected output, so there is no Python install, virtual environment or GPU to set up before the first lesson.
What is the difference between generative AI, AI agents and agentic AI?
Generative AI answers a prompt, an AI agent adds tools it can call, and agentic AI coordinates several agents on a multi-step job. Each is a different system design, so the right choice depends on the task.
Why do AI models invent sources, and what stops it?
A language model predicts likely next words, so a plausible citation can come out whether or not it exists, and asking the same model to double check does not fix that. Retrieval (RAG) helps by giving the model real documents to quote from and letting you check its answer against them.
What is MCP used for?
MCP (Model Context Protocol) gives agents one standard way to discover and call tools, so each tool is integrated once instead of once per agent. It can be the wrong choice when the extra hop does not fit a tight latency budget.
Certificates and online exams
How do I check if a course certificate is real?
Open the issuer's own verification page, by scanning the QR code or entering the certificate number, and check that the name, course, date and result match the document. If the certificate has no ID, QR code or lookup page, ask the issuing institute directly before you rely on it.
How can an institute make its certificates verifiable?
Give every certificate a unique ID and a public lookup page, ideally reached by a QR code on the certificate, that shows the name, course, date, result and whether it is still valid. LogicWiz Exams issues certificates with a certificate number, a short code, a QR code and a public check page.
Can students answer an online test in handwriting?
Yes. Students write on paper, photograph each page with a phone and upload it to the question, and the teacher marks the photo; in LogicWiz Exams AI can suggest a mark that the teacher reviews before results go out.
How do you reduce cheating in online tests?
No online test is cheat-proof, so the aim is to make cheating hard and likely to be noticed: a paper that is hard to copy, a locked-down browser, a limit on leaving the exam tab and an optional camera check that only raises flags. A person should review every flag before anyone is accused.
Which online exam software suits a coaching institute in India?
Start from the tests you actually run: MCQ test series, coding tests, handwritten or essay answers, and whether you need certificates under your own brand. Shortlist two or three tools that fit and run one real test on each.
What does white-label mean for an exam platform?
Vendors use it for anything from a logo on the test page to your own domain, emails and certificates with no vendor branding. Ask which of those you get before students see someone else's name.
Placement and interview preparation
How do I prepare for TCS NQT in 30 days?
Spend the first two weeks on the Foundation topics (numerical, verbal and reasoning), the third on timed sectional sets plus Advanced aptitude and coding if you want Digital or Prime, and the fourth on full mocks and reviewing every mistake. Practise each sub-section on its own 25-minute clock, and answer every question, because TCS iON says there is no negative marking.
What is in the Infosys online test for freshers?
Prep sites agree on four timed sections, logical reasoning, mathematical ability, verbal ability and pseudocode, and some also report a puzzle section and a writing task, as reported in October 2026. Infosys does not publish one pattern, so check the instructions for your own drive.
In what order should I study aptitude for placements?
Start with number system and percentages, then the topics built on them (ratios, profit and loss, interest, mixtures), then rates (time and work, speed and distance), and finish with permutation, probability and data interpretation. Learn each topic untimed, then drill it on a timer.
How can I practise for a job interview on my own?
Pick 10 to 15 likely questions, answer each out loud while recording yourself, and check the playback for a direct answer, one specific example and a length of about two minutes. Once your answers are steady, add follow-up questions from a friend or an AI mock interviewer.
How should a fresher answer HR interview questions?
Answer each question in about a minute with one specific example from your studies, project or internship, be honest about anything in your record, and link the answer back to the job. The common questions repeat, so prepare bullet points for each and practise them out loud.
Can I prepare for campus placements for free?
Yes. Free aptitude question banks and company-pattern mocks, free coding sites, NPTEL courses (free to learn, with an optional paid exam for a certificate) and free interview practice cover what a typical placement test and interview ask.
Interviews and hiring
How do you test whether a developer can judge AI-written code?
Give the candidate a confident AI-written answer with exactly one planted mistake, ask them to review it out loud, and score whether they find the line, explain why it is wrong and leave the correct lines alone. A shared document and a scorecard are enough to run it.
How do I practise spotting a wrong line in an AI answer before an interview?
Read the answer line by line, name the rule each line depends on and ask what would make it false, then explain the fix in one sentence. You can practise this free in the Spot Aria's Mistake game on LogicWiz Arena or in the LogicWiz Interviews mock round that plants a mistake.
Are there free AI mock interviews for freshers in India?
Yes, several tools offer free practice, though "free" ranges from free forever to one trial session, and only some handle technical rounds. LogicWiz Interviews gives 1 typed and 1 spoken AI mock interview a week on the free Spark plan, with no card.
What do the LogicWiz student plans include?
Every lesson is free, and Spark, the free plan, gives practice on LogicWiz Exams and Interviews with no card. The paid Ace and Wizard plans add more mock tests, AI practice papers and interviews with Aria, and one plan covers logicwiz.ai, Exams and Interviews.
What should a technical interview scorecard include?
A few competencies, each with written behavioural anchors for what every score means, so two interviewers who saw the same answer give the same score. Each interviewer should fill it in before the debrief.
How do you run a fair hiring debrief?
Have every interviewer submit written scores privately before the meeting, and show nobody anyone else's scores until all are in. Then start the meeting from the points where interviewers disagree, and have one named person record the decision.
Which SQL interview answers sound right but are wrong?
Common ones involve NULL comparisons, joins that silently drop rows, HAVING versus WHERE, and date ranges. Each can be checked with a small query you run yourself.