B.Tech Computer Science and Engineering

No, sorry to say, but you cannot get admission with this percentage. Your rank is also not good. It is in lakhs. I will suggest you to fill improvement form and try for good colleges next year.

You should apply for:
Guru Gobind Singh Indraprastha University
Maharaja Agrasen Institute of Technology
Northern India Engineering College

Yes, there are colleges that offer D2D (Diploma to degree admission) to students who have finished their Diploma, check the list of colleges and their procedures through which they give admission.

Nearly 400 companies visited campus last year.
University is adjudged as best in terms of placement.

Hi,
1. B.Tech (CS) has a lot of subjects, if you see all the four years course structure.
2. It also varies college-to-college.
3. If you could tell us which college or university are you considering?

It would be around 1.5 lakh rupees per semester.

I think the best place for B. Tech CSE is Rayat Bahra University, offering unique course, called New Age Programme, in coloration with Siemens, Google, & IBM. Along with engineering curriculum, they are teaching skills used in industry to make the candidate industry ready engineer. You will get certification from those companies and it will be taught by industry experts of Google and IBM.
So, I think it is a very good course from viewpoint of placement, package and dream companies.

Hello Siddhartha,
VJTI is among the top colleges which you can get through MHT-CET. So, you really need to score high marks to get admission in VJTI. Considering CSE branch, anything more than 160 will be considered safe for admission.
All the best.