See as you know that the total marks changes every year. So if you ignore those fluctuations and include the study curve in such a way that you assume the competition increases then also with a marks of around 250 you will expect a rank atleast in top 350.

**Although I don't think competition will increase. Some toppers and serious students will go on studying but in general the average ones will decrease more. So technically, you will have a wide spread distribution statistics with maximum concentration in the higher marks and lower marks.

To know more about JEE Advanced you may visit the link below:

https://engineering.careers360.com/articles/jee-advanced-rank-list

I hope my answer helps. All the very best for your future endeavors!