I've Physics, Chemistry, Maths, English and Physical Education. Am I eligible for these subjects?And is there any circular regarding improvement exams published by CBSE?

in same year is that possible to give compartment exam after clearing improvement exam

I got compartment in maths and I was enable to pass it on my first and second attempt,now I passed in 3 attempt so am I Eligible to give improvement exam,as now I have passed in my all subjects.But the problem is, I appeared for my boards in 2019 and now after 1.5 year I have passed, whereas improvement can only be given after one year of passing 12th