Hii

On the basis of your percentile score, you can calculate only your estimated rank and not the final rank because the rank will differ after the final result will be declared.
As of now you can use our rank predictor tool to calculate your estimated rank
https://engineering.careers360.com/jee-main-rank-predictor
As per our predictions you rank will be around 240,989 - 270,989.
This is not the exact rank, and only our prediction, for exact final rank you must wait for official list to be released.
Guarantee for admission to any good college can not be given as the cutoffs are yet to be declared for the admissions.
You need to wait till the april end for cutoffs and final results.
You can appear in april session also and try your best to improve your score. The best of the two scores would be used for final results.

Hope this helps.