If you get 30000 general rank, your OBC rank will be around 6000 - 7000. With this rank you may get chance in NIT with home state quota. It will be quite difficult to get CSE with this rank. Always mention your state with this kind of questions related to recommendation of college. Use JEE MAIN COLLEGE PREDICTOR to know about your admission chances:

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

• IIIT Kalyani - Indian Institute of Information Technology
• IIIT Nagpur - Indian Institute of Information Technology
• UIET - University Institute of Engineering and Technology, Panjab University
• Punjab University (PUCHD)
• Pondicherry Engineering College - PEC
• Tezpur University - TEZU
• Jamia Millia Islamia - JMI
• IIITDM Kurnool - Indian Institute of Information Technology Design & Manufacturing
• IIIT Pune - International Institute of Information Technology
• IIIT Bhagalpur - Indian Institute of Information Technology
• IIIT Ranchi - Indian Institute of Information Technology
• IIIT Manipur - Indian Institute of Information Technology