Hello Aspirant,

Hope you are doing all good. Your question seems to be ambiguous. It is not clear from your question what do you mean by "30 percentile in 4th Sem of JEE Mains 2021". However, if you meant to say, you have received 30 percentile in JEE Mains, then unfortunately, it is very difficult for you to get any government college.

You can still checkout all the colleges you will be eligible for by using the JEE College Predictor App: https://engineering.careers360.com/jee-main-college-predictor?utm_source=qna&utm_medium=jee_cp

Hope this helps.