Hivikramnugge ,
I would buy OG 2018. Very often, the new questions are posted on this forum. So, you can work on OG 2018 questions, and later work with the new questions. For example, the link below contains new questions in OG 2018 - the questions that were added to OG 2017.
https://gmatclub.com/forum/the-official ... 42995.html
So, eventually you'll have more questions
...
I would buy OG 2018. Very often, the new questions are posted on this forum. So, you can work on OG 2018 questions, and later work with the new questions. For example, the link below contains new questions in OG 2018 - the questions that were added to OG 2017.
https://gmatclub.com/forum/the-official ... 42995.html
So, eventually you'll have more questions
...
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