Diploma

Having an additional Diploma or certificate will add up in your CV and will help you in getting more opportunities in that field.

Yes, it is the easiest thing to do. You failed in class 12th board exam no problem apply for the NIOS, which is the national institute of open school and you can appear for the class 12th and you can also. So, I join the college for Diploma or polytechnic at the base of class 10th result so you can do both of them simultaneously.

No, you should go for B.Tech means after 12th, you should clear JEE and then take do B.Tech in reputed colleges like IIT NIT and others.

Yes, you can get admission after JEE exam clearing.

Hi,
Yes, you may get IIT-B but you have to make it confirm whether they accept backlog or not. Try to find out that information first.

I will tell you in a job oriented way. PG Diploma in Preventive & Promotive Healthcare
Diploma in Paithani Handicraft & Modern Garments
Yuvodaya
Diploma in Archives Keeping
Certification in Finance and Accounts
Diploma in Education Technology
PG Diploma in Instructional Design
But the student interest is very important. Plan accordingly and choose the way for a brighter future.

See it completely depends on type of domain. Since you have graduated with Diploma in computer science. It will be difficult for you to go for fashion designing. So all the best for your future.

Take a look at the following link: https://www.shiksha.com/engineering/colleges/distance-correspondence-diploma-courses-delhi-ncr