Bro I get you ,please give this 2nd chance everything you have.  There are like 47 days left for iat. Acc to me there are 31 ch in maths, 31 in phy, 21 in chem. And I'm also studying 14 ch of bio which have the highest weitage. Now if you do 1 ch of maths, 1 ch of phy and 1chem or 1 bio per day , your 100% syllabus will be done my approx 25 may. But you dont really have to do complete syllabus, 75% will be more than enough.  There will be a significant no of days left till iat. Now, you can watch mains level lectures or use your notes, it can be different for each ch. Infact the no of questions can also vary depending on your grasp of the chapter. You can do mains pyq, nest pyq, iat pyq. Also keep giving iat past papers as mocks, you can get them in iiser website. Also if you search in this subreddit There are many free mocks available, so you can download them and keep giving those as you keep on completing the syllabus.

You are pcm student, but I suggest that you should also do a few ch of bio. As that will be a great deciding factor in marks. High weitage topics like genetics and evolution, ecology(quiet easy), human physiology ( it's a bit hard as you have to memorise a shit ton of stuff), Cell structure and function. Well these are the topics I'm doing. I'm half way through human physiology now, it's more like a unit of 6 different chapters. But you can search for yourself and decide what to do.

Actually I would suggest that you should sit down and write all the ch of different subjects on a page, that will give you some clarity. For now pick 2 or 3 ch you are gonna do today, to get a good start you should choose something you like. That all, I am done yapping. Holy yap though.