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Core companies hire mechanical, electrical and civil graduates to design, build, run and test real equipment, so their placement rounds check whether you understand your branch, not only whether you can solve puzzles fast. That means you prepare along three tracks at once: core subjects, your own lab and project work, and aptitude.
What do core engineering companies test in placements?
Every company sets its own process, so read each job description carefully. In general, expect to prepare for three things:
Core technical questions from second- and third-year subjects, often asked as "explain why" rather than "recite the formula".
Your lab and project work, because it shows you have handled real equipment and data.
Aptitude and reasoning, usually as an online test before the technical interview.
Public sector companies can add a fourth step. For example, POWERGRID's Engineer Trainee-2026 notice recruits electrical, electronics, civil and computer science graduates through GATE-2026. If that route interests you, read our guide on how to get PSU jobs after BTech, with or without GATE.
How do you revise core subjects for mechanical, electrical and civil roles?
Start with a free, official topic list: the GATE syllabus for your branch. The GATE 2027 papers and syllabus page, run by IIT Madras as organising institute, states that each paper carries 100 marks, with 15 for General Aptitude and 85 for the subject syllabus. You do not have to sit GATE to use it as a checklist.
Pick the subjects interviewers can ask you about in depth:
Mechanical: the GATE 2027 ME syllabus includes engineering mechanics, mechanics of materials, theory of machines, machine design, fluid mechanics, heat transfer, thermodynamics, and manufacturing and metrology.
Electrical: the GATE 2027 EE syllabus includes electric circuits, electrical machines, power systems, control systems, measurements, analog and digital electronics, and power electronics.
Civil: the GATE 2027 CE syllabus includes structural, geotechnical, water resources, environmental and transportation engineering.
Know three or four of your strongest subjects well rather than skimming ten. If an old topic has gone fuzzy, NPTEL courses cover civil, electrical and mechanical engineering, and enrolment is free.
How you revise matters as much as what. In a study by Roediger and Karpicke, students who tested themselves on a passage remembered more two days and a week later than students who reread it, even though rereading made them feel more confident. A review of ten study techniques by Dunlosky and colleagues rated practice testing and distributed practice as high utility, and rereading and highlighting as low utility.
So close the book and answer out loud. Here is a worked example for a mechanical student revising beams:
Draw the shear force and bending moment diagrams for a simply supported beam with a central point load, from memory.
Say where the bending moment peaks and why.
Explain what changes if the same load is spread evenly along the beam.
Only now open your notes and mark what you missed. Ask the same three questions again in three days.
When you find a gap in the basics, the Fermi Concept Library has a lesson for every concept in physics and mathematics. And if you keep using the wrong method on numericals, the Fermi Problem Library has a step-by-step solver that explains the reasoning rather than printing an answer.
How should you explain your lab and project work in an interview?
You already know your projects and labs, so this is the part of the interview you can prepare most fully. Use this five-line script for every project and major lab experiment:
Problem: "We wanted to find out..." in one sentence.
Method: the setup, the instruments, and why you chose them.
Result: one number you measured, with its unit.
What went wrong: a source of error or a failed first attempt.
What you would change: one specific improvement.
How much aptitude practice do you need for core placements?
When aptitude comes as an online test before the interview, it decides whether you reach the technical round at all. A short timed set each day, with a weekly review of the questions you got wrong, keeps it sharp without taking over your core revision. Our guide on how to prepare for aptitude tests in campus placements breaks down the question types.
A six-week plan before placement season
If placements are still more than a semester away, start with our guide on when to start placement preparation in B.Tech. Closer to the season, use this:
Week 1: Download your branch syllabus, pick three or four core subjects, and write your five-line script for each project.
Weeks 2 to 4: Revise one subject a week by self-testing. Add a short daily aptitude set.
Week 5: Go back to earlier subjects with mixed questions, so you are recalling them after a gap.
Week 6: Do mock interviews with a friend: ten minutes on your project, ten on core questions.
Not sure where to start? Fermi's AI tutor works out what you already know and builds a plan for the session, so you sit down to a clear next step.
