Since you have scored 87 percentile in JEE Mains January Attempt and looking at last year's cutoff percentile score, which for OBC-NCL candidates was 74.31..you have successfully qualified JEE Mains and you can appear in the upcoming JEE Mains april Attempt as well as JEE Advanced too. So you can either focus on getting more percentile for April Attempt of JEE Mains or also you can start preparation for JEE Advanced as well from now only.
If you get more better percentile in JEE Mains April Attempt then you might get a good NIT and if you get well prepared for Advanced and get a good score in it then it will be great that you could get an IIT too .
Therefore you can start preparation for JEE Advanced from now on and give your full focus to get a good score.
Thank you.

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