I bought an Anker T320 bluetooth keyboard to use with my iPad, mainly because it had such good reviews on Amazon. It's an amazingly good keyboard! It's really light – much smaller and lighter than the Apple bluetooth keyboard I was using before. It charges via mini-USB. The keystroke action is excellent. I am very happy with it. Here is my Amazon Affiliate link to the keyboard should you want to buy it: Anker® T320 Ultrathin (4mm) Wireless Bluetooth Keyboard for iOS (iPad Air, iPad Mini 2, iPad 2 / 3 / 4), Windows and Android 3.0 and above OS with Built-in lithium battery / Aluminum Body.
I’ve been studying for another Maths exam. This time it’s the Open University M343 “Applications of Probability” course. It’s exam time so I’ve been making flash-cards to study with.