There’s not much information in your post to actually be able to suggest something concrete. 

Keep in mind that to improve verbal it is not important how many times you have done the OG, but how well did you do the OG; how much did you learn from each question and how well were you able to apply what you learned.

How much were you scoring in the Verbal section on your practice tests ? Was this score of 25 on verbal an anomaly or was it on the lines of what you had been getting on your practice tests ?

When do you plan to take the test now ? Your preparation plan will depend on how much time you have on hand. Basically you need to give us more data, so that we can suggest to you a plan of action.

In the meantime, go through the links below containing similar discussions. You will find them helpful.

http://www.aristotleprep.com/f…..plan-help/

http://www.aristotleprep.com/f…..eparation/

http://www.aristotleprep.com/f…..help/#p712

If in the practice tests you were getting scores between 15-25, so on the actual GMAT you got a score on similar lines.

You have not provided much information again-how did you study the last time around, what changes are you planning to incoporate in your studying habits et. Information like this actually helps in figuring out the root cause of the problem.

However, from whatever data you have give, your low Verbal scores indicate that your basics on Verbal are weak and you should firstly focus on building a strong foundation rather than going for the difficult questions and doing the advanced stuff. You have also not mentioned that how long have you been studying for the GMAT for the re-take. Anyway, at the moment you are left with around 50 days for the re-take. The first thing you should do is make a good plan for yourself so that you can prepare systematically.

Identify the areas which trouble you and keep special blocks of time to tackle those areas. Go through a particular concept first and then do a sufficient number of questions testing your specifically on that particular concept. Also remember that  do not practice a crazy number of questions. What is of immense importance is the learning you derive from a question.

Also make sure that you do not overstudy. This is something which candidates do very often when they re-take an exam. They study so much that they bring themselves to the point of exhaustion. So 2-3 hours on the weekdays and 4-5 hours on the weekends should be sufficient.