Reasons for getting an Answer Right in CAT

What makes us mark a correct answer in the mock CAT?

After talking to a lot of students and observing their attempts, I found out that students choose the correct option when:
1. They know the formula (Quant. or DI) or meaning (Vocabulary) and patiently crack the question
2. They are wise in picking up the questions they know they can solve
3. The question is very easy to solve
4. The question came from a topic, whose concept the students have revised twice
5. The question belongs to a series of questions in a Case let, and the students have invested a few precious minutes to crack it

There are plenty of other reasons. Just put them as COMMENTS to this post