Engineering

A diploma holder can join B.Tech course (regular or distance) by D2D process after completing Diploma in Engineering. B.Tech program allows Diploma students to take entry directly into second year of engineering course.
For taking admission in B.Tech, you must have done at least 3 years diploma after

You can get admission only if you have done your Diploma. Else, you have to start from first year you can't get admission in direct second year.
Good luck.

You need to improve your overall skills like personality, knowledge in the particular field. You are required to be completely focused on your professional development.

No, you have to get some sort of marks in JEE Mains. You need to score 150+ to get NIT from general category. You can try for Government College, Semi Government College, and top private college.