MPC student can pursue Defence Services through NDA which requires Mathematics in Class 12, so you have an advantage of choosing Physics, Chemistry and Maths subjects.
Besides becoming an Engineering aspirant, you can wish to choose Biotechnology field, or can go for higher degree in Mathematics and Statistics.
If you are fond of chemical reactions, you can go for higher degree in some field of Chemistry and research.

You can also go for B.Sc programe in particular field as per your interest, It all depends on your Career goal & interest.

 

Good Luck!