If you have a high enough speed after the first double jump in 2, you can do a single jump to get to the checkpoint and after that go to the edge of the platform and double jump to complete the level. If you want to see what the strat looks like, heres the video link:

seems somebody is trying to improve my trash record

Not really im just trying to get my first sub 4 and that strat is rarely used in my attempts so yeah

And my attempts usually get killed because my djs failed

same