my air is 2918 and im getting my branch in newer iits. should i take the subjects of my choice in them or take any subjects in the oler iits

HEY DEAR
I THOPE THE DOUBT HAS BEEN RESOLVED TILL NOW
IF YOUR BROTHER OR SISTER OR ANY OTHER KNWON RELATIVE IS PREPARING FOR IIT YOU CAN TELL HIM/HER ABOUT ASKIITIANS SERVICES WHERE HE OR SHE CAN ASK DOUBTS , CHECK STUDY MATERIAL AND ALSO ACCESS MANY OTHER SERVICES
THANKS