In my mock exam I only got 37/100 on the foundation tier non-calculator paper. After using the RULER booklet and using the system I achieved 85/100. Former Year 11 Student
In a nutshell RULER is practising exam questions with a system. They tend to be more 'wordy' and it's often identifying what you should do that causes problems. You can read more guidance here and find the pupil template here.
You should work on these problems frequently and ensure you use the full system. More information can be found here and there is template on Page 11 of the planner.
Year 7 and 8 Problems here - password ask Mr Tanner.
Medium (up to ~Grade 5) problems here
Hard (up to ~ Grade 7) Problems here