So you passed out 12th class with the subjects PCM, so you are basically aiming for engineering or if PCB then Medical (This is the most common choice for most students)

Apart from that-

•You can opt for Bsc courses in Physics ,Chemistry and Mathematics.

•You can go for Aviation courses!

•You can expect a commendable career in the Indian army,Navy and Airforce also!

•You can appear for ICAR(PCM stream) to get into B.tech biotechnology ,B.tech Food technology and processing and B.tech In dairy technology.(These fields are expected to expand in the future years)

•You can appear NEST entrance exam to get into NISER Bhubanewsar and CBS Mumbai, if you are interested to pursue research in pure sciences. You can go for IISERs too(admission through Kvpy,Jee advanced and IISER IAT test)

•You can go for Computer Applications and IT(BCA then MCA) or ethical hacking.

•You can expect a career in statistics and animation graphics.

•You can go for fashion technology.

•Prepare for UPSC (civil services) and eventually crack it for a highly paid govt job

You can do anything that interests you. Remember doing the work you really like will give you a lot in return.

This are some of the career options I have provided.

I hope my answer helps. All the very best for your future endeavors!

Hii!
Although you haven't specified the subject stream you are studying in class 12th, let me tell you there are wide opportunities and courses you can opt for after class 12th. Choose courses such as medical, engineering, agriculture, defence, law, mass communication or mass media, journalism, business, entrepreneurship, acting, modeling, fashion designing, etc., As per your subject field or interests.
Hope this helps.
Good luck!