B.Tech

You should search for GFTIs and few NITs of East zone.

No, for getting Galgotias College of Engineering, your rank must be less than 20k in UPSEE but your rank is quite high. So, you must try in any other college for admission in engineering.

Yes, it is necessary to give improvement exam of atleast 5 subjects to eligible for JEE. As this part is also mentioned in the JEE Mains information bulletin.

No, you may not get admission in NITs with this score if you belong to the reserve category. You can try for Thapar University, AMU, etc.

Sorry to say Naveen. By the counseling of JEE by josaa admission is possible in IITs NITs and GFTIs. So, you have to be in the merit list or your rank must be less than the closing rank of college and your rank is to high which is above the closing rank of all the college by JOSAA. So, you must try

Hello Deepankar,
Yes, you can get Government college of UPSEE as your rank is good. Please check the college detail in the link provided:
https://www.shiksha.com/b-tech/resources/upsee-college-predictor

Techno India, Salt lake is a better option.

Generally Central universities have better infrastructure and faculty in comparison to State Universities and colleges. You have not specified name of colleges and universities therefore, it will be difficult to provide specific advice.

To become a programmer, you should choose B.Tech in CSE.

Contact admission cell by visiting the website with your marks. They will guide you through. You have to go through an interview for admission.