i got 69 percentile in jee main january 2020 i am in category section am i able to fill jee advance form

Satyam, See, the cutoff for JEE ADVANCED eligibility depends on your category status and since you haven't clearly specified your category, it is difficult to predict your eligibility. However, here I am answering your query in a generic way and also discuss the previous year cutoff which would help you in getting an idea. So, As of now, it is difficult to predict the actual qualifying NTA score for JEE Advanced eligibility. However, if you have a percentile above 85-86 for any category student,  then you have a decent enough chance to qualify. Also, you can refer to the previous year JEE Main qualifying cutoff scores by NTA as follows to understand your chances:-

Common Rank List (CRL)

89.7548849


GEN-EWS

78.2174869


Other Backward Classes (OBC-NCL)

74.3166557


Scheduled Caste (SC)

54.0128155


Scheduled Tribe (ST)

44.3345172


PwD

0.11371730

Therefore, looking at previous year's trends, you can predict your chances to qualify for JEE Advanced as you haven't specified your category status.

Also, you have another opportunity to improve your results by performing better in the April JEE MAINS attempt and I would advise you to concentrate on that and give it your best shot.