Hello aspirant,

Hope you are doing well. For taking admission in any goverment college you need to score atleast 75% in 10+2 exams and also clear the JEE main exam and need to bring good rank in JEE . Also for private university you need to clear their respective examination  and for checking your rank you can use the rank predictor 

Link-https://engineering.careers360.com/jee-main-rank-predictor

Hope this helps

If any queries feel free to ask

All the best!!

Regards