Hey shilpi.

See the marks u have scored can be considered as the low average score in the JEE MAINS but since u are from SC category then it is a good one. Since u are from WEST BENGAL u can take the advantage of the home state quota for NIT DURGAPUR  as it takes low score for giving admission in the NIT. U can also apply for other NITs also for ur btech career but college might not be that good.

I m providing u a link for ur help.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/jee-main-college-predictor&ved=2ahUKEwjZkMOY7s_hAhXm6XMBHbdcDiQQFjABegQIBRAB&usg=AOvVaw1pTMu5LewXe0n3JPiA8V2U

Ask if any query. Good luck