The irony is that this meme works in reverse for that. At least, in order of mind blowing as I refreshed my memory, it goes multiplication (very easy), dot (scalars easy), cross (vectors medium) and convolution (integrals hard).
In fact, I never did the later two but convolution looks fun.
I was 1 most of the time, but my advisor was 4 so it worked.
No way I could pull off 3 with my build, I'd look like a super villain.