Hi

It's quite difficult to predict whether you will be eligible for JEE advanced or not as qualifying cutoff percentile keeps changing every year depending upon various factors like number of students that appeared in the exam, kind of marks obtained by them , toughness level of the examination etc.

But if we look at  past your Trends, for example jee main in 2019 qualifying cutoff percentile to be eligible for JEE advanced is given below for sc category

Scheduled Caste (SC) :- 54.0128155 percentile

Now, you have got 81 percentile, that is more than 54 percentile which was last year cutoff percentile for sc category to be eligible for JEE advanced.

Thus you hold very good chance for qualifying jee mains 2020 examination and so you will be eligible for JEE advanced examination.

Thank you