How to analyze CR answers in the OG?

Hi. So, I'm in the last week or so of my preparation for the GMAT. I had read it somewhere that it's best to do OG questions in the ending phase of your prep. Hence, I'm at it now. The thing is that I'm not sure how to review each answer.

Here's what I've been doing: Do a batch of 10 questions chosen randomly by the software (I'm practicing OG on computer). Then, I review each question, including the ones I get right. Now, this is where it hurts. Do I need to review each question, including each answer choice to see why it was wrong or why it was right? It ends up taking a lot of time, not mentioning how frustrating it gets.

Is my approach the right way to do the CR questions in the OG or am I being too hard on myself? Honestly, I can bear all the frustrations if eventually it's good for my score. I just need to know if my approach is effective or not.

Thanks in advance.