Codehs

CodeHS is an interactive online learning platform offering computer science and programming instruction for schools and individual pupils.

An incredible set of curriculums, including Python, Java, SQL and more, that cover a range of content a very valuable resource that includes self marking assignments and coding challenges for pupils.

There is an option to pay a subscription that has the option to custom create courses and lots of other great features. However, the access your get for free is still excellent. Fun, engaging, self marking challenges where you can go at their own pace. Free version is definitely worth a look!