You can check the eligibility criteria of the exams below

UPSEE-  You should have passed the qualifying exam without grace with minimum 45% marks (40% marks for SC/ST Category candidates) 

To check the complete eligibility criteria you can refer below link

https://engineering.careers360.com/articles/upsee-eligibility-criteria

WBJEE- You should have secured an aggregate of 45% and reserved category candidates should have scored 40% aggregate marks in P/C/M all candidates are required to have qualified English in 10+2 with atleast 30% marks.

To check the complete eligibility criteria you can refer below link

https://engineering.careers360.com/articles/wbjee-eligibility-criteria

JEE Main- In order to be eligible for NITs/IIITs and GFTIs you should have 75% marks in your boards exam or you should be in top 20 percentile. For ST/SC you should have 65% marks.

For DTU and NSIT you should have 60% aggregate marks in P/C/M. There is relaxtion of marks for reserved category. Counselling will be held through JAC Delhi.

There are many private colleges as well who consider JEE Main to provide admission. You have to apply for the application form seperately for these colleges.

You can check the list below

https://engineering.careers360.com/colleges/ranking/top-private-engineering-colleges-in-India-accepting-jee-main-score

AMU- Youmust have scored a minimum of 50% marks in your 12th class for appearing in AMUEEE. 

Good Luck!!