K J Somaiya College of Engineering

Yes, the cutoff for CSE is around 155, hence, you'll easily get CSE in probably the second round.
Moreover, you'll get IT and the below branches in the first round itself.
Best of luck.

Hello,
I hope you are doing well. You can check the list of colleges including NITs and IIITs that you can get according to your marks and rank. Use Shiksha JEE college predictor:
https://www.shiksha.com/b-tech/resources/jee-mains-collegepredictor?utm_source=connect&utm_medium=CR_JEECP&utm_campaign=7489993

Hi Akash, You can use the MHCET 2018 College Predictor option available on Shiksha. Com. College Predictor helps students to get an idea about the chances of admission in the college of their choice based on MHCET 2018 result. Please refer the link below for your reference:
https://www.shiksha.com/b-tech/resources/mhcet-college-predictor.

No, you cannot get a good college in Mumbai with these marks.

No, with 12 marks you will not get K.J.Somaiya but you will get other colleges .Best of luck for your future and if any query feel free to ask. Do upvote if you like answer.

The best way to get admission is to qualify GATE. There are many entrance exams of several universities for admission in M.Tech. You can get notifications from noticeboard.com about various exams /internships.

Although they have minority system for Marwadi. Kindly confirm once with the authorities which will save your time. Best regards.

There is a counseling system in Gujarat University or you can attempt entrance exam for the college in Gujarat . About quota, it will depend on your score in entrance exam.