Hey,

First of all, there won't be any issue if you switch from GTU to another board while lateral entry. Just that, the university in which you are seeking admission allows the same.
Now about admissions, you can either give JEE mains and get admission in IITs or you can enter a good college through lateral entry.
IITs don't give admission in 2nd year directly, you will have to start from the first year itself.
Talking about good Colleges, you can take Admissions in Gujarat itself if you want. Some of the good colleges in Gujarat are as follows:

• Nirma University
• MSU, Baroda.
• Parul University.
• CGPIT, Bardoli.
• Vishwakarma Governmentt engineering College.
• ADIT, Anand.
• Parul University.

Other than these, you can get Lateral entry into the following colleges:

• Anna University, Tamil Nadu.
• Jadhavpur University, Kolkata.
• Thappar institute of engineering and technology, Punjab.
• PSG College of technology, Coimbatore.
• Amity University, Uttar Pradesh.
• Manipal institute of technology, Manipal.
• Delhi technological University ( DTU).
• College of engineering, Pune.
• VIT, Pune.

Universities may have their own entrance examination for admissions. The general eligibility criteria is that you must have completed your diploma with 45-50% score with mathematics as subject.

Hope this helps!

Hello Sarvagya,

after the diploma you have a chance to get into the IIT's and not NIT's

and the IIT Bombay is currently the best college for the mechanical engineering.

apart from the IIt's the other colleges say,

1.(MIT,pune) Geit gunupur, punjab institute of technology etc..

Hope it helps.

All the best.

Hello Aspirant,
There are many colleges accepting lateral entry,
Best of some of them are.

Anna University
JADAVPUR UNIVERSITY
Thapar institute of engineering and technology
Psg College of technology
Manipal institute of technology

Hope this helps you