Your first port of call for resources and support should be the Microsoft Team that has been set up by your class teacher.
Below are some video resources, written notes and past paper questions. When using video resources be sure to watch actively; take notes, pause the video and attempt questions you think you can do without an example and rewind bits you’re unsure of.
Whole Course Notes
Video Resources
Factorising: common factor difference of 2 squares quadratics 1 quadratics 2
Volume: prism cone pyramid sphere
Changing the subject of a formula
Using the Sine and Cosine Rules
Quadratics 1 2 3 4 5
Sample Papers
N5 practice paper A N5 paper A Answers
N5 practice paper B N5 paper B Answers
N5 practice paper C N5 paper C Answers
N5 practice paper D N5 paper D Answers
N5 practice paper E N5 paper E Answers
N5 practice paper F N5 paper F Answers
Questions by topic
You can find past paper questions arranged by topic and much more at the National 5 Mathematics website.