I have OG 2018 (Including Quant&Verb Review), is buying OG 2020 worth?

They are few new questions.
You can use the question bank of GMATclub to filter out the new question in 2019 and 2020 versions.
After searching 2019 and 2020 questions, observe which ones have "2019" and "2020" tags only without previous dates tags

You will get the directory of 2019 and 2020 added questions in GMATCLUB.
So, you need not buy new versions

Posted from my mobile device

All the questions are available here. And the OG2020 is not much different from previous OGs, although there are some new questions included.

However, I still like to have a physical copy of the latest OG. With a physical copy, you can refer to it easily when you cannot get online or are tired of looking at a screen. For these reasons, I recommend purchase. If your need is with something else, then you can forgo buying.

There isn’t a lot of a difference between the OG 18 and the OG20. But in each edition of the official guide, GMAC adds about 100 new questions. So according to me, it is worth having a look at the OG20. Try searching it on torrents you might be able to download it. Official guide questions are the closest you can find to the real GMAT. Considering you have time, try solving as many official questions as possible.

Posted from my mobile device

Many thanks for the response guys, i almost finished the Quant part of OG including the review, quite confident on that section now. Thinking of purchasing either Math revolution/Target test prep before moving on to Verbal.

Hi Verytas,

To properly plan out this next phase of your studies, you really need to be more specific about the work that you've done so far along with your timeline and goals. It's possible that some of what you're considering is 'redundant' or might otherwise make your studies more complicated than they need to be. If you can answer my prior questions, I'm sure that you'll receive plenty of advice about how to best get to your Score Goal.

GMAT assassins aren't born, they're made,
Rich

Hi EMPOWERgmat, sorry for the late reply, on your questions above:

Studies:
1) Are you currently studying for the GMAT? For how long have you studied and how many hours do you typically study each week? Yes, ~3 hours on working day, ~8 hours on weekend
2) What study materials have you used so far? OG, OG reviews
3) On what dates did you take EACH of your CATs/mocks and how did you score on EACH (including the Quant and Verbal Scaled Scores for EACH)? Not yet

Goals:
4) What is your overall goal score? 760
5) When are you planning to apply to Business School? Next Year
6) What Schools are you planning to apply to? Cambridge, Oxford, Cornell

Hi Verytas,

Since it sounds as if you have put in some significant study time already, then you really MUST take a FULL-LENGTH CAT (including the Essay and IR sections) sometime soon - perhaps this weekend). That initial diagnostic CAT is important - it helps to define your current strengths and weaknesses and gives you a basis for comparison as you continue to study. Most Test Takers are not happy with that first CAT result, but that's not a big deal - the extra months of available study time are there so that you can IMPROVE on this initial practice result. Once you have that Score, you should post back here and we can discuss the results and how best to proceed.

As an aside, the 760+ score is the 99th percentile - meaning that 99% of Test Takers never score that high (regardless of how long they study or the number of times that they take the GMAT). Thankfully, NO Business School requires a score that high - so it's important to realize that the score that you "want" and the score that you "need" are not the same thing.

GMAT assassins aren't born, they're made,
Rich