Diploma

Yes, you can pursue degree after diploma. There is no restriction for it.

First complete your class 12th, after that you can join any reputed college.
In Pune PICT college is best.
You are lucky, because you are in Pune.
Go for it.

Hi Teju,
You can study abroad after your diploma in engineering. First you check admission requirements and prepare, simultaneously apply for the passport and visa and as mentioned on the other answer even a person who has not studied can get a passport.

If you are interested in the business field then opt for BBA. It has a vast scope.

To apply for MLT, you need to have 10+2 passed with science stream subjects (with biology subject) from a recognized board as the minimum educational qualification.

You can do B.Tech or B.Sc. BBA is a good option too.

It depends on your skills. Both the fields are good.