Engineering Eligibility

Yes, you can pursue it and secure a good job as well.
MITSkills, Pune (Advanced Post Graduate Programme in Piping Design and Engineering with PDMS and CAESAR-I)
Vishwakarma Institute of Technology (VIT) - Pune
Asian Academy of professional training (AAPT) - Pune
Indian Institute of Technology, Bombay (IIT)
These are some of the best colleges for the same:
http://www.vit.edu/index.php/admissions/piping-engineering-course

Biomedical Engineering
Biomedical Engineering (BME) is the application of engineering principles and design concepts to medicine and biology for healthcare purposes. Students who wish to pursue this field must have a Masters (MS, M.Tech, MSE, or M.Eng.) or a Doctoral (Ph.D.) degree in BME (Biomedical Engineering) or another branch of engineering with considerable potential for BME overlap.

Hello Shubham,
I don't think weapon course is available in India at any university. Please correct me if I am wrong.
However, if you are interested in weapons technology, then I suggest you make an effort to join DRDO as a young scientist. There you will get enough opportunities to learn about weapons technology.

Dear Student,
Eligibility criteria will be 50% in PCM 12th and a good score in MH-CET or JEE 2018.

Hello Kalpesh,
Almost every state bars students from other states seeking admission in 2nd year via lateral entry. Hence you will have your correspond with prospective institute to know details.

Different colleges have different criteria.

Hello Venkatesh,
I am really amazed that you have managed to clear 12th even with these low marks. However, unfortunately you are not eligible to apply for a seat in engineering college.