When you worked out the OG questions did you use an
error log ? i.e. did you track all the questions that you got wrong ? You MUST Review each question properly . Don't do questions just for the heck of finishing them . Try to learn why you're making mistakes .
A verbal score of 24 indicates that your time management is bad or that you are a bit weak in all 3 sections . Do you do all your practice questions with a stopwatch ? This is very important , there is no point in getting a question right if it's going to take you 5 minutes to do the questions !
For CR and RC , the OG questions are more than enough . For SC you might need to do a bit more than the OG , but considering your time constraints I'd say just review all your mistakes in the OG and do the GMAT prep question pack 1 .
Hope this helps ! Best of luck ! Feel free to post back If you have more questions !
Posted from GMAT ToolKit