ERROR LOG HELP, PLEAAASE!

Hi,

please help me on this question. This problem is doing my head in, as we say in the UK.

I'm very confused as to what to do with my error log AFTER I've completed thorough analysis of a problem question - do I put it into the error log to reattempt later down the track and mark it as 'unresolved' in the error log, or do I forget about it and just assume the information has sunk in?

I saw this post on the MGMAT site somewhere:
"
Short drills of mixed-topic problems from the Official Guides.

The GMAC has already done the prep work for you – they’ve jumbled up the problems by topic but arranged them in order of difficulty. So do 5-10 problems in a row. Don’t skip any. Treat the exercise “as if” you were taking the GMAT. And then spend double the time afterwards reviewing and mastering each problem."

the question is, what do I do concerning the error log for that problem after I've done this:
"And then spend double the time afterwards reviewing and mastering each problem."

This is the biggest thing holding me back - I just dont know what to do with the error log after the first 'iteration' of putting a problem in there - do I need to go back and redo every single question in the error log over and over until I get them 100% correct without any problems? I feel I'm getting so bogged down in the error log, marking off questions as 'mastered/not mastered','correct/incorrect' etc. and going back to those questions over, and over, and over again until they're mastereda...

I've attached a screenshot of my error log so far. I'm sure I'm not doing it correctly.