Colleges in Pune

You can go to the institute from where you want to do Diploma and apply there for admission. Some institute also take entrance exam for admission in Diploma.

Check out the link below for information and for detailed information, download the brochure from the link below:
https://www.shiksha.com/engineering/course/diploma-in-computer-engineering-government-polytechnic-pune-shivaji-nagar-275292

Hello Amisha,
For getting admission into College of Engineering, Pune, you have to attempt MHCET and need to score more than 130 marks to get any branches there.
All the best.

Hello Rahul,
Yes, you can take admission in MIT Pune via MHCET, some seats are reserved for outside Maharashtra candidates also, but you need to score good to get admission there.
Best of luck.

Hello Ksitiz,
Yes, this college do provide management quota seats. So, if you are ready to spend some money, then you may consult to the college itself they will guide you better.
All the best.

Year back means you are not able to qualify a minimum set of desired exams in an year, hence you are not promoted to the next year. Minimum exams you need to qualify is around 60% that is if you have 10 exams in an year then you need to qualify at least 6 exams to be promoted to the next year
Details
https://www.shiksha.com/b-tech/course/b-tech-in-computer-science-and-engineering-lateral-entry-college-of-engineering-and-technology-biju-patnaik-university-of-technology-Bhubaneswar-251344.