For information about number of students qualified in jee main 2017 you can visit the link given below.

https://www.google.co.in/amp/s/www.shiksha.com/b-tech/articles/amp/jee-main-2017-result-analysis-blogId-14290

In 2018 around 224000 students qualified for jee advance for more details you can visit the link given below

https://engineering.careers360.com/articles/jee-main%3Famp&ved=2ahUKEwib_sqsycDbAhUCgI8KHQzpBmgQFjABegQIBxAB&usg=AOvVaw1OC45S5ay8RP2LUc-4PFFT&ampcf=1

Best of luck!

I don't know about qualified candidates but this year 231024 students were eligible for jee advanced.. 

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