I got 70% in 12th class .which engineering college i sholud join.?

Congratulations, 'The course to join would entirely depend upon in which field you want to pursue your future,your interests etc. So, I suggest to take a research about the various course in Engineering,colleges,placement statistics,the scope for future etc. To mention few I would suggest you to Joi

It would be easier to suggest colleges if you put down your subjects studied in 12th and the city/state in which you are looking for admissions.

Can u please specify the area you are preferring so that i can help u more particularly!

Depends on your choice. now i think u can opt for IT. but u have good options like MARINE and electrical & electronics too.