the only hard part is percieving that a triple wall jump is possible.
when you have the platforms arranged; there should be one that's immediately jumpable on, another that you can double jump to (either from the first or off the ground) and a third platform above the first. jump onto the second, face the wall, away from the area you can climb upto immediately, then triple wall jump; with the last jump been off the wall the first platform is pushed up against.