Hello, 

• JEE Advanced is a national-level entrance exam conducted to facilitate admissions to the prestigious Indian Institutes of Technology (IITs) and a few other colleges.
• JEE Advanced is the second entrance exam after JEE Main for students who are willing to seek admission to IITs. Every year, around 14-15 lakhs students appear for JEE Main. Candidates who clear JEE Main 2019 (Paper 1) and appear in the list of top 2,45,000 will be eligible to appear for JEE Advanced 2019 examination. In turn, only a few thousand aspirants among them who qualify in JEE Advanced will be selected for counselling and allotted seat in respective colleges.

For more information related to the exam and eligibility you can visit below link :

• https://engineering.careers360.com/exams/jee-advanced

Hope this helped. 

Good luck.