DTU - Delhi Technological University

Yes, very easily you'll get admitted into NSUT and many other nits as well.

No, You don't have chances in DTU/NSIT.

Congratulations Vandana, for securing a very good rank in JEE Mains. You should definitely opt for CSE in IIIT DELHI as it is a super tech university and will serve you better placement and environment to nurture your computer skills. Fill JoSSA as well and fill IIIT Hyderabad CSE too as it will be the best option for you its better than many IITs as well.

If you are a general category you cannot get admission to DTU. But as you have scored well in boards I think you should opt for a partial drop by getting admitted to any of the Delhi University colleges and prepare for the next attempt. This will help you as you'll not be too much pressurized by your parents and can focus on your goal well.

It's going to be tough but maybe you have a chance in spot round for getting biotech. You should go for IP University affiliated colleges as you can get a good branch in a good college there.

Yes, they accept improvement marks as they now become your new marks.

If you are having any category EWS, OBC, or SC/ST then you can get a lower branch in DTU/NSIT otherwise maybe you'll get something in IP University affiliated colleges. You can definitely get a good private college like galgotias, ABJ Abdul kalam university, or some other colleges as well. Hope you'll find the best.