Which are the NITs I can get admission with 98 JEE main marks and 90% marks in West Bengal Board?

Chances are remote but still you can hope for the best. Otherwise there are many private universities around the country that offer you admission on the basis of your JEE score directly or on the basis of your marks in 12th. Some of thes also offer scholarships to meritorious students.
Check the websites of some private universities like SRM, SMU, LPU, etc for more details about courses as well as other details.

Chances are remote but still you can hope for the best. Otherwise there are many private universities around the country that offer you admission on the basis of your JEE score directly or on the basis of your marks in 12th. Some of thes also offer scholarships to meritorious students.
Check the websites of some private universities like SRM, SMU, LPU, etc for more details about courses as well as other details.