Sir what is the difference of accuracy and percentile which is meantion in our score card and how many marks should we get to get 99%

Hi
Accuracy means the number of questions you got correct with respect to the number of questions you attempted.
For example : You attempted 50 questions and got 40 correct then your accuracy will be 80%.
Percentile means the percentage of students behind you in the exam for example if test is given by 100 students and your rank is 20 then that means 80 students are behind you and your percentile will be 80 .
Percentile mainly depends on the level of paper and how other students have performed in the exam so 99 percentile in every test can vary depending on the level of the paper .