Hey.

There are various number of options that are available to you after you pursue your 12th with subjects- Physics, Chemistry and Maths.  The most sought after course in Btech/BE that you can pursue. Other than it there are various others-

BARCH

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