Hello Sarthak,

when you are filling form for the jee mains, feed the marks of new 3 subjects which you have given as an improvement and the rest 2 subjects as it is.

The goal is to achieve 75% as aggregate, so make sure your improvement exam does this.

If your 3 subjects were P,C,M then upload their marks and rest others and at the time of counselling, take both the marksheets with you i.e, the improved one and the previous one.

hope this helps!