Hello Chirag Bisht,

If you got 77.46 marks in JEE mains exam,according to the previous data you are qualified the JEE mains exam. And the criteria for the JEE advanced exam is

• qualified in JEE mains exam
• less than 26 years.
• JEE Advanced can be attempted a maximum of two times in two consecutive years by the candidates.
• Appearance in 12th (or equivalent) Examination
• Candidates who have been admitted in an IIT will not be eligible for JEE Advanced 2020.

For more details once visit the below link.,

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

Hope this helps you....