I checked classmates.com when the claim David Hogg had graduated from Renado Shores California first started. His entry was added just before that claim was made, and after the Parkland shooting. The source of the claim appears to be the "Laguna Beach Antifa" which is a fake antifa site. If he is a "crisis actor" it is inconceivable that if he had already graduated high school from California, he would create a account saying that after claiming to be a Parkland survivor. This was already brought up on Free Republic at the time.
Now what I would really like to see him explain are the youtube videos of him claiming to be at Parkland during the shooting. Vortex Math Library, has videos of him claiming the shooting started at 9:32 in "DH Time Stamp Comment Version" and later at 2:52 in "SmokingGunHogg". Its hard to avoid reaching the conclusion he faked his videos to push his politics.
...Its hard to avoid reaching the conclusion he faked his videos to push his politics. Agreed. So it would appear he may have made the video recording using his cell phone in the morning, during a drill, and then returned later with his camera.