There are many options. It depends on your interest & capability. 

Here are some of the options you can opt as per your interest.

If you are PCM student. 

B.E/ B.tech, B.Arch

If you are PCB student then you can go for MBBS, BDS & other paramedical courses like BAMS, BHMS etc.

The other options you can opt-

Bachelor of Science in specializations under the pure sciences domain such as Maths, Physics, Chemistry, Botany, Zoology etc.

if you are interested for Management, Commerce or Law programme then you can go for BBA, B.com, B.A LLB etc.

You can choose any of the option as per your interest. You can also refer the below given link for further information about.

https://www.careers360.com/courses-after-12th-science

Good Luck!