Error Log is very ambiguous in many respects... do search the most useful approach for yourself, but here is my idea of
error log:
You should not only look at the hit rates in each section as you mentioned (RC, DS, PS... etc), but also subdivide those in categories:
For instance
SC: 1)SVA 2)Pronouns 3)Modifiers 4)Idioms 5)||sm etc etc
CR: 1)Strengthen 2)Weaken 3)Assumption 4)Inference 5)Explain/Resolve etc
RC: 1)Main idea 2)Detail 3)Inference etc
PS: 1)Number properties 2)Algebra 3)Word Problems etc
DS: 1)Number Properties 2) Inequalities etc etc
Now, many people make excel spreadsheets for this, but personally I find this time-consuming... and if you want to go the same route, use the Official
error log of this site
https://www.gmatclub.com/content/courses/mistakes.php
I go differently about this... I have
MGMAT books as well as GMAX material that lists problems by type in each section (similar to the list above)... these questions come from OG 10 or 11, whichever you have... you can see the patterns after you finish with those and can calculate your hit rate based on that
For most difficult problems I write flash cards with the solution on the back... and sometimes draw a question to see if I can solve it WITHOUT the answers given (no ABCDE choices, so can't backsolve, which takes longer anyway)
also I would stay away from KAPLAN 800 Verbal and Kaplan verbal overall because it isn't really representative of the test. (I have both books)... Nothing beats OG for the verbal part, so make sure you know how to answer each and EVERY question in OG!!! Kaplan math is harder, but OK for practice, as long as your ego can swallow the practice scores.
good luck