Hi mukhia.
In working with people, I used to push them to read the passage first, feeling that having the question in mind can distract a test-taker from really understanding the passage.
Also, I find that, even if you do not read the question first, you can to at least some degree tell what you have to notice in the passage in order to answer the question, and really, regardless of what type of question you are going to answer, you have do do the same thing when you read the passage, fully understand the passage and notice key details.
However, many people just feel more comfortable reading the question first, and, while I personally prefer to read the passage first and find reading the question first to be both distracting and a waste of time, the truth is that, in Critical Reasoning, but NOT in Reading Comprehension, if one is careful, either way works about as effectively as the other.
So, I eventually realized that different people have different ways of operating and that, since there is not much difference between reading the passage first and reading the question first, probably, in this case, people just should do what feels more natural for them unless one or the other is really causing them problems for some reason.
So, the upshot of all of this is that, if you are accustomed to reading the passage before you read the question, then there is no reason to switch now.
That said, a little decision like this one is not going to make or break your CR performance. What will make your CR performance soar is getting better at understanding the passages, noticing details, and defining the logical relationships between what the passages say and what the answer choices say. So, for increasing your CR score, your best move is take your time answering practice questions and learn to clearly define exactly why each incorrect choice is incorrect and each correct answer is correct.