When starting earlier is not the answer

Everything up to here was written for the person who cannot start. If you prepared and then went blank, none of it was aimed at you, and doing more of it will not help.

That is worth saying plainly, because the usual advice given to somebody in your position is to revise harder, and the usual result is a person who revises harder, blanks again, and concludes there is something wrong with them that work cannot reach.

There is not. There is a different process happening, and it happens in the room rather than in the weeks before it.