CMI preparation pls help

  • Recently I was preparing for Jee Mains as I am currently in class 12 ,until I found out about CMI.
  • As they offer Bsc in physics and Mathematics which are the subjects of my interest, I had a long lost dream of becoming a physicist which I gave up due to rot jee preparation. I am brain dead from the past 2 years.
  • I prepared for math olympiad for a while when i was in class 9 but was unable to clear and had done few chapters of precollege mathematics book which i don,t remember shit about.
  • I have heard that the exam is pretty tough one of mathematics with olympiad questions.
  • And there are only 30-40 seats in this course.
  • As there are only 5 months left out of which 2 months boards will be going on so i have 3 months to prepare. I don,t want to take drop at all.
  • pls suggest resources as I have no idea what to do, people are suggesting all kind of weird foreign authors book.
  • I have done partial theory of math for Jee preparation. I can also prepare for iiser but this will be my first preference if possible.