NIT Rourkela All Questions

No, You can't take up biotechnology course based on NEET score.

You can take up biotechnology course based on your 12th marks or by writing entrance exams (depending upon different colleges). 

Congratulations on getting this much rank in jee main 2018.

http://tools.collegepravesh.com/college-predictor/jee-main/

Visit this link and enter all your credentials to have an idea regarding which colleges you will be getting on the basis of your rank.

I am listing here a few colleges which you can get on the basis of this rank

• Indian Institute of Information Technology, Design & Manufacturing, Kancheepuram
• National Institute of Technology Sikkim
• National Institute of Technology, Rourkela
• National Institute of Technology Durgapur
• National Institute of Technology Agartala
• National Institute of Technology Hamirpur
• Indian Institute of Information Technology Surat
• National Institute of Technology Nagaland
• National Institute of Technology Arunachal Pradesh 
• Indian Institute of Information Technology(IIIT) Una, Himachal Pradesh
• Indian Institute of Information Technology Guwahati
• Dr. B R Ambedkar National Institute of Technology, Jalandhar
• National Institute of Technology Meghalaya
• National Institute of Technology, Jamshedpur
• Indian Institute of Information Technology (IIIT) Nagpur
• Indian Institute of Information Technology (IIIT) Pune

YES. Since it is a procedure you had to follow which, you are currently out of the admission process. But you still have a chance in the last round which is generally taken after all the main rounds of admission are done. This extra round is usually for the vacant seats left in the end. So, you still have a chance to get admission though it may not be the desired seat you wanted.