Hey.
There are various number of options that are available to you after you pursue your 12th with subjects- Physics, Chemistry, Maths and computer science.
The most sought after course in Btech/BE that you can pursue. There are various courses in Btech that you can choose from. The choice between these streams would depend on the marks that you score in the respective entrance exam, prefernces of candidates ranked above you, and also your area of interest.Aerospace Engineering
Computer Science Engineering
Mechanical Engineering
Electrical Engineering
Civil Engineering
Engineering Electronics and Communication Engineering
Information Technology
Aeronautical Engineering
Automobile Engineering
Automation and Robotics Automation and Robotics
Electrical and Electronics Engineering
Architecture Engineering
Mechatronics Engineering
Electronics and Computer Engineering
Chemical Engineering
Electronics and Telecommunication Engineering
Aircraft Manufacturing and Maintenance Engineering
Petroleum Engineering
Biotechnology Engineering
Electronics and Instrumentation Engineering
Automotive Engineering
Agricultural and Food Engineering
Petrochemical Engineering
Building and Construction Engineering
Nuclear Engineering
Admission in these in various engineering colleges can be done through entrances like- JEE Mains, JEE Advanced, state level entrances like WBJEE, UPSEE, COMEDK etc

B ARCH
You can also go for Architecture courses by pursuing the degree of B Arch in Architecture and Planning. Admission in these courses are done through youre score or ranks in entrance examinations, Some entrances for the same are- Jee Mains Paper 2, NATA, Some state level entrances like WBJEE,UPSEE, COMEDK, OJEE,EAMCET etc

Other Career options that you have other than these are-
BCA degree i.e Bachelors in Computer Application after which you can go for MCA or even MBA for a lucrative career.BSC Degree i.e Bachelors in Science. There is a lot of scope after a bsc degree too. You can pursue Bsc degree in various feilds like Phyisics, Chemistry, Maths, COmputer, Agriculture, horticulture,forestory and a lot more.

Management Feilds- You can also begin to pursue a career in management by opting for BBA ie Bachelors in Business Adminstration or BCom ie Bachelors in Commerce and pursuing MBA later on.

You can apply for NDA. With a non medical background, you will be applicable for all 3 wings of NDA- Army, Navy, Air Force

Hotel Management- This is another lucrative field which people are choosing now a days, Admission here is done through entrances like NCHM JEE, MAH CET, IPUCET BHMCT, PU THAT etc

You can also change your field and pursue law through integrated courses of 5 years like BA LLB, BCOMLLB, BSC LLB etc. Admission is done through entrance exams like CLAT, AILET, LSAT, SLAT etc
Best of luck