To determine if your device is compatible, sign in to the Google Play Store with the same account your tablet is registered to and go to the page for Old School RuneScape. It should tell you which of your devices it will work with.
To the best of my knowledge, the mobile app does not support the use of a keyboard and mouse.
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Can I play osrs on tablets?
Yes, you should be able to. Most tablets these days meet the minimum system requirements. Ref: https://oldschool.runescape.wiki/w/Game_Requirements
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More specifically one running Android go.
You should be able to as long as you're not running other apps at the same time. The thing about Android Go tablets is that they're sort-of like a Venezuelan Canaima laptop. They're really good very cheap computers that hypothetically speaking should allow you to play RuneScape 3 no problem as long as you're not attempting to run other programs at the same time. And in comparison, Old School RuneScape can run on a toaster. So I have no doubt that there is a way to play OSRS Mobile on one of them Android Go tablets, but I can't say that the conventional way of simply downloading OSRS Mobile from the Play Store will or will not work since I haven't tried it. Most retail stores give you a 14-day return policy on technology products, so you could always buy one of those tablets just to test it out and return it if it doesn't work out.
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Was wondering if I can, can I use Bluetooth keyboard and mouse?
Maybe. I haven't tried using a Bluetooth mouse and keyboard on a phone or tablet, but I've used a mouse and keyboard on OSRS Mobile in Bluestacks on my desktop. So I think that would depend on the tablet recognizing the Bluetooth keyboard and mouse and letting you use it on top of the app. Worst case scenario, you can always connect remotely to something like an Amazon Virtual Machine or GeForce Now using your tablet to connect to a more powerful computer. I've played OSRS from a Virtual Machine and the only thing that bothered me was the keyboard sometimes wouldn't work, but the mouse always worked fine.