Seneca

Seneca is a website for learning, with a free version as well as several different subscription plans. I haven't tried the paid subscription, but I've used the free version quite a lot.

It is often fast-paced, and relies on quick recalling and repeat. They give you a few lines of information, accompanied by a picture, and then give a question immediately best on the text. They then give more information, another question, some more questions, more text… you get the idea. It might sound boring, but the fast-paced method is actually quite a good way to learn, as you can easily go back to see where you went wrong. Seneca also adds memes and funny pictures/gifs at the end of a section/ topic, which may sound distracting, but personally, I find it to make the site even more interesting and engaging.

The site has almost every subject, broken down into smaller topics. The more you do it, the higher you can go up in the leaderboard as you accumulate points.

I'd say the only disadvantage is that the questions are quite repetitive - they are engaging, and also switch the type of questions around, but there aren't many types. This means that if you repeat the same section, you'll end up doing the same thing, which may get slightly boring after a while. However, this shouldn't be too much of a problem, as the site is best for revision, like I said, and therefore shouldn't be used too frequently.

Overall, this is a great tool to recall information that you need for a test the next day… just remember to understand the content before revising...