V surendar,

Well there are many competitive exams that you can write after the completion of engineering in the stream Mechatronics . The list of exams that you can write includes,

1. Civil Services Examination.2. Indian Economic Service Examination3. Indian Statistical Service Examination4. Combined Defence Services Examination (CDSE) 5. National Defence Academy & Naval Academy Examination6. Combined Medical Services Examination7. Engineering Services Examinations8. Staff Selection for different Cadres9. Exam for different posts through Reserve Bank of India Services Board10. Exam for Development Officers and others through National Bank for Agriculture & Rural Development (NABARD)11. Exam for Telecom Officers in the Department of Telecommunications 12. GATE13. CEED 14. NIFT Entrance Exam15. XAT