CBSE 12th

1. If you only like either Physics, Chemistry and Maths as a subject, engineering might not be good for you as every specialisation in engineering combined either of two subjects P, C or M. So, if you like only one subject out of P, C, and M look at options to do core science related courses in these individual subjects like:
If you like only Physics, you have career options like Astrophysics, Geophysics, Molecular Physics, Nuclear Physics, and Optical Physics.
If you like only Chemistry, you have career options like Biochemistry, Nuclear Chemistry, Organic Chemistry, Physical Chemistry, etc.
If you like only Maths, you have career options like Applied Mathematics, Statistics, Geometric Analyst, and Computational Mathematics.
So, the key thing is to see that if you are passionate about only 1 subject or 2 subjects out of P,C and M.also look at careers in Legal Studies, Design (product Design, UI Design etc.), Media & Communication etc.
3. Architecture
4. Defence Services - NDA
5. IT - Yes its a part of engineering, but you can look at IT as only CODING. So if you love coding and high reasoning skills, you may opt for IT courses like BCA, Networking, BSC in computers etc.