Hello,
The cut off for JEE main is not yet declared.It will be out after the declaration of JEE main April session results.So you need to wait to know the official cut off.However, a percentile 85 or above will give you a decent chance to qualify JEE main and eligible for JEE advanced. You have not mentioned your category but if you belong to general category you may not qualify JEE main you need appear in April session.
There is nothing to do with the percentile you got in January session to appear once again in April session.If you want to get good percentile in April session you can appear once again irrespective of the percentile you got in January session.

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