Maharashtra

Hi
68% is not bad so why you wish to waste another year in 12th. Though you can repeat 12th, just check for the admission in cbse school or may be NIOS is another option. If you could share your future career plan, it would be easy to guide you.

approx. 170 for gov. and 140+for private colg.

U can get it through jee
.taking admission through cet is dificult because the cutt off of top eng. institutions is 140

both are good but no. of colleges are more in West Bengal

Opt for the engineering branch that you love the most and are most passionate about and analyze the future work conditions, scope and growth prospects before taking admission
You can also opt for psychometric test comprising of Aptitude, personality and career interest to clear confusion
Follow the link below for colleges :
Mumbai :
https://engineering.shiksha.com/be-btech-courses-in-mumbai-all-ctpg
Pune :
https://engineering.shiksha.com/be-btech-courses-in-pune-ctpg

If you want IIM, Then you have to score above 99%ile, and for Mumbai,Pune above 90%ile.

If you want to improve your English, then start the reading of newspapers like 'Times of India, Indian Express, The Hindu' and write the difficult words and their meanings in a notebook. Then, watch English News or listen commentary of sports in English. You'll definitely improve your English. There are a lot of classes for improving English. Google it like - 'Top or Best English learning classes in Thane.' You can get the list of popular English classes. Best of luck !