I m thinking to appear for NSE Olympiad ? Answer doulbt

I m confused , btw I m jee 27 tard , 11th not wasted , 12 going superb ,
I WANT TO APPEAR FOR NSEP AND NSEC BUT SUGGESTIONS SAY CHOOSE ONE AND THEN GO DEEP INTO IT ..
BUT I M CONFUSED, WHICH ONE TO PICK .
I WILL COMPLETE CHEM JEE SYLLABUS BY 10 SEPT . AND NSEC IS ON 22 NOV.
MY PHY SYLLABUS WOULD BE COMPLETED BY 10 OCT AND NSEP IS ALSO ON 22 NOV.
JUST SUGGEST ME WHICH ONE TO CHOOSE??