Hi School does not have it, so looking to buy for son, Y10, in Sep. Costs £200 a year or £300 for 2 years. Understandably trying to establish if it is credible with a good correlation with top end results, please.
Have you tried Seneca learning? It’s free to sign up - I use it with my classes and they seem to like it. Covers a range of subjects and exam boards. You may need to set up a teacher/ parent account to assign courses to your DS for him to be able to access the content.