Mechanical Engineering

It is the best place for mechanical engineers. You need to score high in IELTS, around 6.5 band and due to huge competition your Bachelor score should be over 80%.

You class 12th score is little low, but IELTS score is good. You can appear for SAT exam and this will increase your admission chances.
Below mentioned is the list of best universities:
1. University of Melbourne.
2. RMIT University.
3. Monash University.
4. University of Sydney, etc.

Try to get 80% in 12th if you want to go in reputed university in USA but anyways 75% is also good. After your 12th you need to give GRE and TOEFL exam if you want to go in engineering from abroad.
All the best for your boards exam.

IELTS: 6.5 bands with not less then 6 in any module and at least 75-80% in your graduation.

It's very tough for a mechanical engineer to get placed in core companies via college. You'll get IT company jobs real easy. You need to maintain a good percentage and try those couple or pure companies that come.

Hello Harsh,
Please refer the link provided below:
https://engineering.shiksha.com/be-btech-in-mechanical-engineering-courses-in-gujarat-ctpg
All the best!

For MBA, you need 10+2+3 so ideally, you cannot as Bachelors requirement is not fulfilled. Check the requirements for executive MBA in any university or IGNOU.

Hello Venky,
First you have to choose the study destination. Depending on the country you wish to study, you need to take up the exams. For example, In case of US you need to take GRE and TOEFL. Whereas in other countries, GRE is not mandatory. Try to score well in your Bachelors. If possible strengthen your profile by publishing some papers. Do some research and shortlist the universities. Apply within the deadline.
All the best.