Website: studytime.co.nz/resources/level-3-calculus/
YouTube playlist
Depending on your maths stress levels, this resource's name may not exactly feel true...but Math is Fun will make NCEA more tolerable. It has everything from logs, to differentiation, to complex numbers, and so much more!
Channel: https://www.youtube.com/c/infinityplusone/playlists?view=50&sort=dd&shelf_id=3
Channel has videos on exam prep and strategy for the 'Differentiation', 'Complex Numbers' and 'Integration' topics.
Channel: https://www.youtube.com/c/MrsOGramsMaths/playlists?view=50&sort=dd&shelf_id=2
Has videos on 'Differentiation', 'Integration', 'Complex Numbers', 'Trigonometry', and 'Simultaneous Equations'.
Channel: www.youtube.com/c/CushlaThomson/playlists?view=50&sort=dd&shelf_id=10
Has videos covering the externals ('Differentiation', 'Integration', and 'Complex Numbers') and some of the internals ('Conic Sections' and 'Trigonometry'). She's currently a maths teacher at Wellington College.
Desmos: www.desmos.com/calculator
GeoGebra 3D: www.geogebra.org/3d
Everyone Calc student knows about Desmos, but many don't know its cousin, GeoGebra. GeoGebra is particularly useful in the 'Simultaneous Equations' topic, when you have to visualise 3D planes and how they intersect. It can be useful for 'Conic Sections' too.