Hello,

For getting admission in IIITs, you should clear JEE Mains with good marks. And the JEE Mains syllabus weightage of subjects like Physics, Chemistry and Mathematics of class 11 & 12 NCERT along with reference books and previous year question paper is around 90%.

For knowing more about the syllabus weightage of JEE Mains go through the link given below:-

https://engineering.careers360.com/articles/how-prepare-for-jee-main