Engineering

Yes, you can obviously do mechatronics engineering after Diploma in automobile engineering. Here is a list of top colleges for this course:
Thappar university, Patiala
DTU, Delhi
Maharaja Agra.

1. MIT Pune.
2. Sardar Patel Mumbai.
3. Jadvpur University.
4. BITs.
5. IIT Bombay, Delhi, Kanpur and Kharagpur are providing robotics engineering.

Design is the best and the oldest design institute of India which offers M.Des/B.Des in 20 different streams of design. Please check www.nid.edu for detailed information about 20 streams. After NID, you have lot of other good institutes like IDC, IITB, and other IITs and IISc Bangalore, but they are all in a tech institute campus. The best part about NID is, that it's a design dedicated institute. NID recently got ranked among top 30 design schools in the world.

Universities you can get into for product designing:
1. National Institute of Design, Ahmedabad.
2. Centre for Product Design and Manufacturing (CPDM), IISc.
3. Department of Design- IIT Guwahati.
4. MAEER's MIT Institute of Design.

It entirely depends upon your interest and what you want to do in your life. Once you are able to decide this you will be satisfied with your decision.

National Institute of Design, Ahmedabad can be the good option for B. Des in graphic Design. The eligibility criteria of this course is 12th or Diploma in Engineering. The admission in the B. Des. Courses are done through the NID Entrance Exam.

IMPORTANT DATES
1 CIPET JEE 2020-21 online Application Forms shall be available on 12/01/2020
2 Hosting of Admit Card for CBT based JEE 2020-21 in website and issue to the candidates 25/07/2020 onwards
3 Last date for submission of online application form 31/07/2020
4 Date of CIPET Joint Entrance Examination (JEE) all over India 05/08/2020*Subject to government guidelines on COVID-19
5 Release of Counseling cum Admission letter for the selected candidates for admission and Hosting in website (To be downloaded from https://eadmission.cipet.gov.in) On or before
08/08/2020
6 Date of commencement of course To be declared

As you percentile is good i recommend you to wait for the counseling result because there is higher probability that you can get the good branch in that college .