hello aravind !!
congratulations man for securing 30000 general catergory rank in jee mains!!
with 30000 rank you would be getting :

National Institute of Technology, Andhra Pradesh

Biotechnology Engineering

Indian Institute of Information Technology (IIIT) Nagpur

Electronics & Communication Engineering

Indian Institute of Information Technology(IIIT) Kottayam

Computer Science Engineering

Indian Institute of Information Technology Bhopal

Electronics & Communication Engineering

Indian Institute of Information Technology Design & Manufacturing Kurnool, Andhra Pradesh

Electronics & Communication Engineering

Birla Institute of Technology, Mesra, Ranchi

Production Engineering

International Institute of Information Technology, Bhubaneswar

Electrical Engineering

Indian Institute of Information Technology(IIIT) Dharwad

Electronics & Communication Engineering

National Institute of Technology, Rourkela

Ceramic Engineering

Indian Institute of Information Technology (IIIT) Ranchi

Electronics & Communication Engineering

and many many moree...

However with EWS category you would be getting better college also.lets hope for the best...

I m providing you a link for  knowing colleges in which you can get a seat for your rank  in JEE MAINS  and category,please see the following link :

https://engineering.careers360.com/jee-main-college-predictor

Https://engineering.careers360.com/jee-main-college-predictor?utm_source=C360&utm_medium=qna&utm_campaign=jee-main-college-predictor

All the best

Thank you