websites and apps for study

i was wanting to do one practice question each day for methods and general maths and thought that there might be an app that reminds me to study and gives me a question from a random topic within the subject each day so i can stay fresh on everything, any recommendations? any suggestions for studying tips to do with methods, gen maths, biology, chemistry, english, or specialist would be so appreciated, especially methods and general as they're my 3/4s