Engineer

No, for NIT you have to qualify JEE Mains and for IIT, JEE advance.

Mechatronics engineering is a multidisciplinary field of engineering that includes a combination of mechanical engineering, electronics, computer engineering, telecommunications engineering, systems engineering and control engineering. In recent past it has become synonymous with robotic engineering. Currently, there are good career opportunities for mechatronics engineer in the field of production and R&D.

It depends on your interest. You can go for:
1. Chemical engineering.
2. Mechanical engineering.
3. Aerospace engineering.
4. Geo science engineering.
5. Mining engineering, etc.
You can consider below mentioned colleges:
1. University of Delhi.
2. BITS - Pilani.
3. UPES.
4. MNIT.
5. IIT, etc.

You can consider the below mentioned names:
1. JEE Mains.
2. JEE Advanced: Indian Institutes of Technology Joint Entrance Examination.
3. AIEEE: All India Engineering Architecture Entrance Examination.
4. BITSAT: Birla Institute of Technology and Science Admission Test.
5. ENATEPSI: National Admission Test.
6. VITEEE: Vellore Institute of Technology Engineering Entrance Exam.
7. NAT: National Aptitude Test.
8. GATE: Graduate Aptitude Test in Engineering.
9. PACET: Planning and Architecture Common Entrance Test.
10. ATIT: Admission Test for ICFAI Science and Technology.

For cracking UPSC, all engineering branches have a similar level of difficulty. You may choose your branch based on your interest, not on its ease to clear UPSC.