Diploma

https://www.shiksha.com/b-tech/resources/upsee-college-predictor
Go to the college predictor link I am sharing here to know about the college you can get.
Good luck.

No. Suggest your friend to complete his 12th first. After that, he could take admission in B.Tech CSE.

No. It's completely a private course under a private college. The certification will be provided by Techno India University. Though they will provide you with placement initially, there are many better colleges.

Hello,
No, getting admission in 2nd year just after class 12th is not possible in any college or institute. You have to complete first year to get into the second one and likewise. To complete the graduation, one must complete the entire tenure be it 3 or 4 years.
Thanks.

Yes, absolutely, you are eligible.

For this, you have to give Maharashtra Polytechnic entrance test. You can directly take admission in private colleges but for government colleges, it's mandatory to give the test.

I am a PG 2016 student and I got placed in HDFC bank. I know the highest package offered in my class, it was around 5.8 LPA. I was placed at 4,20,000. All my batchmates were also placed at decent salaries in banks or other financial institutions.

No, way. After completing industrial training in Diploma you can join in 3 years B.Sc course and there will be no option for a 2-year degree when you are pursuing a 3-year degree.

Apply for it, check the last year's cut-off and review. Check regular updates and you will get an idea.
Admission depends upon merit.

You need to be a graduate to pursue MBA. So, you first need to complete your graduation and then explore MBA. Nowadays, a person can appear privately for BA and complete the graduation in 2 years itself.