I got 63%  percentile in jee mains 2019 and I'm from obc category, will I qualify for jee advance

It is difficult to predict your exact qualifying marks or JEE Advance Eligibility. If you want to check the expected rank You can use this formula to calculate your expected rank-

874469 are the number of candidates appeared for the January exam. So rank formula is (100- your total score) * 874469 / 100.

If the number of candidates for April exam increased to 1400000 then your final rank shall be (100- your total score) * 1400000/100.

Good Luck!