Hello there,
Since you have got 65% in your boards, you can apply in any engineering college in West Bengal. The basic eligibility criteria says that the candidate should pass their 10+2 level with atleast 55% aggregate in PCM. Hence, you can apply in any engineering college, apart from IITs and NITs, since these colleges require 75% aggregate.

For engineering colleges, you need to appear for JEE Mains. Since you are from West Bengal, you should appear for WBJEE. You can apply for engineering and architecture through your WBJEE rank.

You can also apply for pharmacy (B.Pharm), or do BSc in subjects like physics, chemistry, IT, and so on.

If you had biology, you can appear for NEET. Using the rank of NEET, you can get admission in MBBS, BDS, BHMS, BAMS.

If you had computer science, you can take the course Bachelor of Computer Applications (BCA). This is also a very good course.

You can also choose other streams like fashion designing, animation and graphic designing, mass communication, media science, and so on. There are many options open for you. All you need is to know which field interests you the most.

Hope this answer helps you.
Good luck!!