Thank you for choosing this app. You will find a wonderful studying materials.We offer form one, form two, form three and form four notes for biology subject. This app is designed to work from android version 5 up to the latest version. We keep all our apps up to date to make sure they are compatible with as many device as possible while keeping an interesting and useful contents for you guys. Please send us feedback through feedback feature in the app so that we can communicate on how to improve our app. We are committed to ensure a good services for both of you. Thank you again for trusting us. You are welcome.