Hello aspirant,

I understand, the pressure a student feels, when he appears for such all India level examination, that too which has so much importance. But don't worry:

https://engineering.careers360.com/articles/jee-main-cutoff

You can see through this link that the average cutoff of JEE main for SC candidates is around, 50. That means you just have to score 50/360 to be eligible for JEE Advance and appear for JOSAA counseling. The link also shows cutoff of each institute associated with JEE

Don't worry, you can score 60 easily out of 360 if you have good knowledge of class 12th portion. According to people, about 60% of paper i.e. around 190-215 marks portion is from class 12th syllabus while the rest is from the class 11th portion. I assume you can easily get 60 marks from 200. 

At last moment I suggest you to go through high scoring but low skill requiring topics, such as Mathematical Reasoning, linear motion, etc... as these have at least one question(4 marks) fixed.

You may also revise for Inorganic and Organic Chemistry reactions, as this is only learning part, and if you learn in an hour or so at least you may pass the cut-off.

Take proper sleep to retain what you already know. If you think that you know nothing or not up to the level of JEE preparation required, be confident in paper or prepare for other exams.

Hope it helps

Regards.