I have got 30 percentile in jee mains 2020 what should I do now

Hi

You will not get any college with this percentile but you can apply for good private universities or institutes who are taking their own entrance exam and having their own admission criteria like:

SHIVNADAR UNIVERSITY

NORTHCAP UNIVERSITY

MANIPAL INSTITUTE OF TECHNOLOGY

BBENNETT UNIVERSITY

IILM UNIVERSITY,GURUGRAM

LOVELY PROFESSIONAL UNIVERSITY

BML MUNJAL UNIVERSITY

AMITY UNIVERSITY

SRM UNIVERSITY etc

You can also try for state level counselling for engineering admission.

IILM UNIVERSITY,GURUGRAM is offering B.tech in computer Science and Information Technology with contemporary computing areas like:

Cloud Computing

Artificial Intelligence (AI)

Big data

Internet of Things (IoT)

Machine Learning

Deep Learning

Image processing

Block Chain

Sagar, with this percentile, you can only apply in colleges that do not require JEE main scores or another option for you is to try in April session of JEE mains. You still have time to prepare and score well.
If you really want to join IIT or NITs than work hard and score good in JEE in April 2020, otherwise go for entrance exams conducted by institutes.
Hope this helps!