Maria Antony
I have practised Quant and Verbal from OG 13th edition, Quant Review 2nd edition and Verbal Review 2nd edition. Will it be a worthy investment to buy the 2019 bundle? How many new questions can I expect in this 2019 bundle when compared to the older versions that I have used?
Most of the time, they replace about 15% of the questions in each edition. So somewhere around 85% of the questions will be the same in the 2018 and 2019 editions.
But if you're using the 13th & 2nd editions? That's a whole different ballgame. The OG has "changed" four times between the 13th and 2019 editions (13th --> 2016 --> 2017 --> 2018 --> 2019), so somewhere around 50-60% of the questions will be new to you. The same will be roughly true for the quant and verbal guides, too.
If I were in your shoes, I wouldn't rush out to buy the 2019 editions until you've exhausted the older ones. They're just a great option to have as a backup if you don't get the score you want using the older ones.
I hope this helps!