75% aggregate criteria is only for JEE Main eligibility and BITSAT (PCM). You are still eligible for exams like:
WBJEE (45% aggregate eligibility for general category and 40% for unreserved category )
UPSEEE(60% aggregate eligibility)
MHT-CET(50% aggregate for General category students and 45% for reserved category students)
COMEDK(45% for general and 40% for unreserved category students)
SRMJEE(60% minimum marks)
VITEEE(60% minimum marks)
Hope this helps. Good luck.