To start with your quants, first make sure that you are strong with basics. If you are not confident, i would suggest you to spend some time with your high school maths. Or you could get all 8 strategy guides of Manhattan GMAT 4th edition. However, i'm not sure how far these strategy guides are good at strengthening your basics. I currently own only MGMAT Number properties guide of Quants and this particular guide is great!

With verbal, get a Powerscore CR bible if you are not confident in CR. Although this book is meant only for CR, it also helps in RC in some way. For sentence correction, MGMAT Sentence Correction guide is the best! But as you have majored in English, i believe you could spend little less time in verbal than in quants.

Good luck with your prep!

Thanks Papgust,

Would you suggest I put the OG guide off until I am first familiar with the basics?

If the Manhattan's won't help with the basics, what do you suggest?

For quants, until you are strong in basics, i would suggest you to not only put off practicing OG problems but also any other source's problems (MGMAT, Kaplan, Princeton Review etc.). Do not straight away start practicing GMAT problems unless you are confident in basics.

I believe that any high school maths will always help in building our foundations well. So if MGMAT guides doesn't help you with basics, search for your high school maths book or get a new one and start working on it. This will definitely help!