If i get 500 can i be sure

This can not be predicted as such. You ust refer to the last year cutoff and get an idea of the score.And rather than worrying about the marks you must at this point of time focus on your preparations so that your score is as high as possible and you secure your seat.https://medicine.careers360.com/articles/neet-cutoff-karnatakaPlease refer to the above link to know the last year cutoff. and i suppose 500 is a safe score  but still i can not be sure about it.