Omnipotence
Kendrick Lamar
It is in the 2U and 3U Syllabus. Integration however is also in the 4U Sylla. You need to know applications of the derivative like tangents and normals to the curve in Conics (4U topic). I think the OP means he needs to master the 2U and 3U skills before he moves into 4U.btw, that seems more like 3 unit then 4 unit.
Also, congrats on your 2 unit mark, but don't get complacent as these marks don't necessarily mean you'll do well in extension.
As mentioned before tuition homework is meant to be harder than school. So if you do well at tuition it should be reflected on your school mark.
-Good Luck with 4U