Will you please suggest me the names of some good Courses to do after 12th Physics, Chemistry, Mathematics???

Yes sure, here I am suggesting you the names of some good Courses to do after 12th (PCM):

Aircraft Maintenance Engineering
B.E ( Manufacturing Processes and Automation Engineering)
B.E (Aeronautical Engineering)
B.E (Applied Marine Information Technology and Communitcation)
B.E (Bio-Medical Engineering)
B.Tech ( Aero Space Engineering)
B.Tech ( Metallurgical and Materials Engineering)
B.Tech (Automobile Engineering)
B.Tech (Bio-technology)
B.Tech (Bioinformatics)
B.Tech (Dairy Technology)
B.E (Chemical Engineering)
B.E (Electronics and Communication Engineering)
B.E (Mechanical Engineering)
B.E (Petroleum and off-shore Engineering)
B.E. (Computer Science & Engineering)
B.E. (Marine Engineering)
B.E.(Hons) Manufacturing
B.E.(Hons) Mechanical
B.Tech (Electrical & Electronics Engineering)
B.Tech (Information Technology Engineering)
B.Tech (Electronics & Telecommunications) & MBA (Telecom) Dual Degree
B.Tech (Mining Engineering)
B.Tech (Paint Tech.)
B.Tech (Instrumentation & Control Engineering)
B.Tech. Textile Technology
B.Tech.(H) in Manufacturing Science and Engineering
B.Tech.- Aerospace Engg.+M.Tech.-Avionics (Dual Degree)
BTech (Applied Mechanics)
BTech (Biological Sciences and Bio-Engineering)
BTech (Civil Engineering)
BTech ( Materials Science)
BTech (Paper Technology)
BTech (Physics)
BTech (Production Engineering)
Diploma in Advanced Computer Arts