Hello Aspirant. 

The eligibility criteria for JEE Advanced 2019 are:

• You must qualify JEE MAIN 2019 and secure a position among the top 2,24,000 candidates (including all categories). 
• The percentages of various categories are: OBC-NCL (27%), SC (15%), ST (7.5%) and Open Category (50.5%). Within each of these categories, 5% horizontal reservation is available for PwD candidates.
• A candidate gets a maximum of two attempts in consecutive years to appear for JEE Advanced.
• Candidates should not have appeared for JEE Advanced 2017 or earlier. 

For more information you can visit here:

https://engineering.careers360.com/articles/jee-advanced-eligibility-criteria

Hope this will help you. 

All the best.