If anyone give CBSE improvement exam in the next year of his/her regular class-12 board exam for improving his/her marks. If he qualify for jee advance exam in the same year then what documents will he require to give for register in jee advance exam.

The confusion begins in case of improvement. If you've applied for improvement in one or more subjects, the final result will show the marks in which your performance has been higher, else the previous marks will hold.

For example:

S1 = 80

S2 = 70

S3 = 72

in the original mark list, and you apply for improvement in S2 and S3, obtaining 75 and 70 respectively. The final marklist will show

S1 = 80

S2 = 75*

S3 = 72

Where * means obtained under improvement attempt.