Since you took the Veritas course (I'm assuming you still have all of the Veritas books) and you already have the Manhattan math guides and the OG, you don't need any more books.
If I were designing a study plan with those materials this is what I would do.
I would spend 2 days a week on math, 2 days a week on verbal and one day mixed review (try to study for 4 straight hours to build stamina for the real exam. 1 day a week take a practice exam (only when you feel ready).
On the math days, I would go through the Manhattan Guides, the only thing I would skip from the Manhattan Guides are combinatorics, probability, and statistics. Veritas does a better job with these topics than Manhattan. Everything else is pretty similar, so there won't be any conflicting strategies or anything like that. After you go through the Manhattan Guides on your math days, go through all of the Veritas Math guides.
On the verbal days, begin with the Arguments book. Once you know that one really well, move on to the other verbal books. After you have completed all of the verbal books and all of the math guides, begin taking practice CATs once a week. Continue to study and review old materials. Use the 1 day a week to study old material. For example, let's say you go through Critical Reasoning 1 and Combinatorics and probability during the week. On the one day that you do mixed review, review problems from those two guides. Let's say the next week you go through Sentence Correction 1 and Problem Solving and Statistics, review problems from those two books on your mixed review day, but also review problems from Critical Reasoning 1 and Combinatorics and Probability. Continue to do this all the way until your test day. Good luck.
