I used Cognito for maths and sciences at GCSE, which helped improve my grade significantly. However, now at A-Levels, Cognito is currently hidden behind a pay wall, as I can barely do any work on quizzes, etc., before being told I must switch to the pro version. Moreover, in the A-Level chemistry section, there are no educational videos, and there is no A-Level maths section at all. It is disappointing, but I'm sure they will add more detail to the A-Level section of the site over time, as for the pay wall, I understand such things are necessary to keep a project like this running at the quality it is.
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We create science and maths resources for students and teachers. We have a YouTube channel with video lessons, and an accompanying revision website, where the content is exam-board-specific, and progress is automatically tracked.