'It would be good for your study' is better.

Hello Terasee~! Thank you for teaching me natural sentences which I can use in real life! have a good evening~!! ^^ ♥

1. It would be good for your study. 2. It would be good for your studying You could also say "It would be good for you to study." But for example, I recommend this book for study. Or I recommend this book for you to study.

Hello Marco! First of all, thank you so much~!!! Is "It would be good when you are studying." the most natural and clear,,,? And how do you think if I change my sentence into "It would be good for study" In that case, does it sound natural..? ^^

To me they both sound a little incomplete and I think you're using the wrong YOUR but I could be wrong. It should be connected with something for example, you should read this book, it would be good/useful when YOU'RE studying. A study can also be a room which is used for studying so when I read "It would be good for YOUR study" I first think of that, for example "You should buy this lamp, it would be good for YOUR study." I would use the second one and add "when" YOU'RE studying.