The questions only test the aptitude but not memory. Please refer to the Previous Papers section for practice.
Questions are selected from a pool randomly. For example, the pool size could be 30 and we select 15 of them randomly.
Ordering of questions and the values in the question are unique.
The scoring is relative. That is, marks for a correct answer depend upon how many people have correctly answered the question.
An easy question correctly solved by several people can fetch 1.12 marks while a hard question solved by very few can fetch as many as 2.99 marks.
Formula used in assigning score to a question is: 1 + 2(1 - success_ratio2/e), where success_ratio is the ratio between number students correctly answered the question and total number of students.