I m expecting 250 to 260 marks in jee paper 2 2020 but negative marks in maths should that effect mr overall percentile? And what rank should I get?

Dear Aspirant

Your marks is good if we talk about getting admission in one of the top nits .
As in this range of marks you will surely get percentile around 99+ .so a good nit has seat for you at this score .You rank will be also in top .
You can also use college predictor to check chances of getting admiited in particular Colleges -

https://engineering.careers360.com/jee-main-college-predictor

If you want to know your percentile and rank then you can use rank predictor tool for which link is mentioned below-

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-rank-predictor

Thanks
All the very best