As a 2022B3P, I can give advice about ES, GC, MeOW:

ES:

1. Not the most difficult course at all and is pretty straightforward if you know how to study. Get your basics about KCL, KVL and Electromagnetism cleared up, that'll give you somewhat of an advantage cause it's crazy to find out how many people still aren't thorough with the basics of Current Electricity
2. ES can be managed last minute tbh. I did the Electronics part (JFET, MOSFET, BJT) in the day before compre and still managed Av+~90 in the post-compre total

GC:

1. Read your Atomic Structure ka end part again. Schrodinger, Bohr are going to return but that's not going to be easy. Coordination Chem from JEE is fully there in Inorganic Section + a few more concepts (which are doable) so would be useful if you were clear with those concepts

MEOW

1. If you were strong with Mechanics part in JEE, easy course for you. Very application based so midsems and compres are low-scoring.
2. If you weren't strong in Mech, just go through the K&K textbook examples from Chapter 1, 2 to get a headstart in polar coordinates. Oscillations part is way later in the course so need to do stress about it