I spent the majority of my time in the half pipe doing a ton of grabs, spins, and specials and barely made the point requirement but on my way I'd usually do a flip trick into a manual at the start and then take the right ramp and do another flip trick before grinding the pipe. Coming off the pipe another flip trick and try to land on the grinding spot below and then another flip trick off into a manual again and ride it to the wall ramp where I'd do a flip and then a grab. After landing that you should have had a a 9 or 10x multiplier and around 50k or more off the start. After that I tend to bypass everything else and do straight for the half pipe. I'm also not very good at this particular level but this is what worked for me and just one of several options. Hope it was any help.