Please check my Gmat Game Plan. 8 Months Plan

I doubt if this is gonna succeed.

Reasons

1) 8 months preparation usually takes score down because of various reasons lack of enthusiasm, over study causing confusion are a few of them. The best results are obtain with preparation of 3 months (approx)

2) Starting to practice CAT from 3rd week isn't a good idea. One should take CAT only when you have done basic preparation with complete syllabus done. So suggestion is start taking CAT only one month before D-Day

In-depth research on GMAT may require 8 months study plan but taking GMAT to score high doesn't require this much time.

All the best!!!

In 3 months time no one can read Kaplan Premier 2013 strategy guide, 9 Manhattan Guides, Kaplan 800, 3 official guides. After all study is done then reviewing of all this and then attempting CAT's will take longer then 3 months.

On beatthegmat expert advise to take CAT once a week, however I agree with you that one should do CAT after absorbing content. I'll do Kaplan Premier 2013 guide and then I'll attempt one CAT a week and study manhattan guides along with it.

I just wanted to point out, I don't see any benefit it waiting to tackle OG material. In fact, you should NOT plan your GMAT study by going chronologically "book by book," but rather "concept by concept," mixing in pacing drills, practice CATs, and strategy sessions (preferably with a reputable tutor). If you go through books front to back then you're really leaning on the book to tell you what to study, whereas I think you should independently choose 5-6 GMAT topics each week and review those in GREAT depth.

I suggest you START with OG13, Kaplan, AND MGMAT, but use them all as resources based on the concept. For example, if one week you decide to hit "SC: Parallelism" as a concept, you should go through ALL of those books, reading all chapters on Parallelism and doing all Parallelism questions. You should also make use of the numerous free videos and blogs on Parallelism here on BTG and GMAT Club, and do pacing drills for Parallelism questions so you can get a sense of how long this particular concept takes you. In addition, you should use your laser-like focus on Parallelism as an opportunity to flex your SC strategy muscles. Notice what concepts are frequently paired with Parallelism. Do an error log for ALL incorrect questions, then review thoroughly.

You can see a bit more about my philosophy here:https://gmatrockstar.com/online-gmat-tutor/

The books you've listed are good, but they won't do the work for you, and certainly not if you plan to just do them cover-to-cover spread out over 8 months. You really risk having no solid strategy development, ignoring pacing, and missing out on true concept mastery.