Bachelors

Dear Chandrakant,
There are many universities offering Diploma. Better option for you would be to join dual Diploma B.Tech course where you save your one year as well as pressure of entrance tests.
After doing a diploma you get direct admission in second year of B.Tech. There are many universities in India that are offering you these dual Diploma- B.Tech courses. Some of them are also offering you scholarships based on your percentage in your previous qualification.
So, i feel instead of simply doing a diploma and then again starting with the search for a college/ university for B.Tech or doing 12th and then giving entrance exams and wait for admission in some good institute. It is better to take admission in an dual Diploma- B.Tech course.
Here are some of the universities, you can visit their websites for more details
NMIMS
Lovely Professional University
Maharishi Markandeshwar Engineering College
Good luck