Dear Ayush ,

Your rank should be around 3000 and it is a very good rank and you can get Civil Engineering and Electrical and Communication Engineering as branches in almost all the NITs. Few top NITs are as follows

• NIT, Tiruchirapalli.
• NIT, Warangal.
• NIT, Suratkal.
• MNNIT, Allahabad.
• NIT, Calicut.
• MNIT, Jaipur.
• MANIT, Bhopal.
• VNIT, Nagpur.

I personally suggest you to go for ECE as it has ver good scope and if you want you can also Computer Science Engineering in some top NITs. 

HOPE IT WORKS.