What happens if someone attempts all 90 JEE Mains questions randomly without solving them, how much is he/she likely to score?

An Extract from QUORA

Ok, so I have this classmate who is writing both the JEE and NEET exams. He had attempted the January JEE. He always used to mark all the answers in mock tests, he never failed to leave a single question out despite the fact that wrong answers have negative marking.

The results came out and he ended up scoring **95 percentile**, which was more than any of the serious JEE aspirants in our class. The most probable reason is his skills of deduction, he can eliminate options like a pro and can land on an answer with a high probability of being correct. So, even if he couldn't solve the questions, marking all the answers led to him getting 95 percentile and that's something!

(P.S. Please don't try marking all the options unless you are absolutely sure about your deduction skills. Doing this will in turn deteriorate your marks drastically. Proceed with caution!)