Indian Institute of Technology, Delhi

Hey Neeraj,
That will not be beneficial most probably. You shouldn't be demoralized at this stage only, you have a long way to go. You can apply to some best private universities and get the same knowledge and pay packages. Private universities are also having best infrastructure now. Some suggestions -

If you are in SC category and qualified than apply for it. Sometimes seats remain vacant in SC category so apply in all IITs. Once you get selected you have a verities of choice to choose among them. All the best

No,you need to give JEE again.

Yes I guess you can.

Admission in colleges is based on the jee main scores not on ur 10th result.

Delhi university, amity university, ipu,lpu

No it is not possible if you are in general category. But you can take admission to other colleges.