Have a look at these videos on this website – find them under ‘LEARN’
Odd one out: https://www.11plus.co.uk/topic/nvr-type-02-odd-shape-out/
3D & Spatial: https://www.11plus.co.uk/topic/nvr-type-12-3d-composite-shapes/
Nets & Cubes: https://www.11plus.co.uk/topic/nvr-type-09-nets-cubes/
For workbooks – start with these two useful book: (1) CGP 11+ Non-verbal Reasoning Study Book & Parents’ Guide for CEM Test and (2) CGP 11+ Non-verbal reasoning Practice Book with Assessment Tests for the CEM Test (ages 10-11).
Hope that helps.