Dear candidate

Getting into Anna University depends on many factors like your category,  the branch or course you are going to, and your category wise respective cutoff score or rank so, no standard score to it as it changes every year based on the difficulty of TANCET exam also so, in general with 90.9 percentile your roughly calculated score will be around 25 to 30 or less so, as you didn't mention you category i am considering it as and for general category you should score a least of 50 to 55 marks to get into Anna University so, it is quite not possible for you to get into Anna University with 90.9 percentile in open category but if you have any reservation it may be possible.

For more Information visit the below mentioned link

https://www.careers360.com/university/anna-university-chennai

Hope this Information is helpful