Hi Nancy,
After the completion of PCMC in 10+2, there are top courses you can choose and build up your career according to your wish.
Some of the top courses are

B Tech- which is Bachelor of engineering or technology, it is a 4 year course. In this, you can choose electrical mechanical, computer science, civil engineering, Aeronautical engineering etc. Top exams for engineering are JEE, GATE, UPSEE, VITEEE, SRMJEE, COMEDK etc.

B.Arch- 5 Year Course in architecture, interested candidates in drawing and about Constructions can join this course.Exams for b arch are NATA,AAT,ITM,NEST,GCET.

B.SC-It is a 3 year Undergraduate program in which a lot of streams are available. Some of the best streams are.

B .SC- Physics, Chemistry,Mathematics,Electronics,Statistics
Also, B.S.C in IT and software is available.

B.CA- It is a 3 year Undergraduate program in computer science. Thus the stream has a lot of career opportunities.

NDA- Candidates can study in National defence academy and get graduate by studying for 3 years. The admission is done through NDA exam.

Also, science stream students can join other systems such as B.A or B.Com.

For doing the above courses you have to get more than 50% of marks in your PUC and also need to qualify the prescribed entrance exam of each college or a University.
Hope you get it, All the best for your future.
If you have any doubts please comment it in the comment box.Thank you