for the Teacher's Pet - 20
achievement ... for the SPIN METHOD
i have to add that i done it with a small trick.
I entered the zone and i started to spin ... BUT ... my car was NOT all of it inside the zone. Only the half of my car was in.
I only got 2 of the 3 triangles full ... but it was continuously filling my 2 triangles.
So i stayed spinning on that spot until i accumulated the points needed for the platinum. easy!!!