Hi aspirant

Earlier it was around 1.25 -1.5 lakhs students .You can take it as top 10-12%ile students qualify for JEE Advance every year.

But from this year due to addition EWS category,the number of qualifying candidate is increased to 2.24 lakhs students.

So these number of students will write JEE Advance this year.

Use college predictor to predict your college on the basis of JEE mains score: https://engineering.careers360.com/jee-main-college-predictor