Well, Arts, Commerce and Science all are good stream, having their own value, but the science has more value in the comparison to other. After completing 12th with PCM you can apply for following courses:

Aircraft Maintenance Engineering
B.E ( Manufacturing Processes and Automation Engineering)
B.E.(Hons) Manufacturing
B.E.(Hons) Mechanical
B.Tech ( Aero Space Engineering)
B.Tech ( Metallurgical and Materials Engineering)
B.Tech (Automobile Engineering)
B.Tech (Bio-technology)
B.Tech (Bioinformatics)
B.E (Aeronautical Engineering)
B.E (Applied Marine Information Technology and Communitcation)
B.E (Bio-Medical Engineering)
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.Tech (Dairy Technology)
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