Physics after Engineering

I got shortlisted for the interview at CESSI, IISER Kolkata for the MS Program in Space Physics. I attended my interview and got selected for the program. Now I'm currently studying here at CESSI. Requirements: Eligibility criteria is to qualify national level entrance exams like GATE (any field not necessarily physics), JEST. There is no such thing as cut off. You need to pass in any one of them with a valid score. Good aggregate in respective Btech curriculum and a good SOP that's submitted during the application. Basic knowledge of physics in Electromagnetic Theory, Quantum Mechanics, Mathematical Physics, Classical Mechanics and others. My Interview experience: This was the first ever interview that I gave. So the first question they asked me was the reason for my transition from Aerospace Engineering to Physics. Then they asked me which subject I was comfortable with, to which I answered EMT. My first question was on Maxwell's equations. One of them asked me t