Hello Confused Soul,

To get admission in Top IITs try to score 55+ marks in IIT JAM. Try to achieve rank in top 400. Then you can get IIT. For Top IIT such as IIT Delhi, IIT Kanpur, IIT Kharagpur you have to secure rank in top 50. 

you can get Top nit such as NIT Rourkela, NIT Warangal, MNIT Jaipur at 45+ marks till round 3 CCMN Counselling. 

Good Luck.