The fundamental subjects of mechanical engineering usually include:

Mathematics (in particular, calculus, differential equations, and linear algebra)
Basic physical sciences (including physics and chemistry)
Statics and dynamics
Strength of materials and solid mechanics
Materials Engineering, Composites
Thermodynamics, heat transfer, energy conversion, and HVAC
Fuels, combustion, Internal combustion engine
Fluid mechanics (including fluid statics and fluid dynamics)
Mechanism and Machine design (including kinematics and dynamics)
Instrumentation and measurement
Manufacturing engineering, technology, or processes
Vibration, control theory and control engineering
Hydraulics, and pneumatics
Mechatronics, and robotics
Engineering design and product design
Drafting, computer-aided design (CAD) and computer-aided manufacturing (CAM) etc.


And students often opt for ME as it has good scope as
after this, you can appear for RRB exam to get in to Railways for jobs. CDS also you can try for. You can apply for suitable positions in either Indian Navy/Air force/Army. One can also attend bank recruitment examinations. After B.E you can try for PO/Specialist Officer positions in banks. You can also attend PSU exams to get in to public sector companies like BHEL, BEL, NTPC, ISRO, DRDO etc. Apart from this you can also appear for UPSC and SSC exams to enter other prominent government departments like Civil services, Income tax, Excise and Customs, CPO etc.


Hope this helps!!!