Audiobooks sped up to ~2x or so, but you usually have to build up to that speed.

There are also exercises which help develop short term memory like n-back training for which there are many phone apps.

Oh you don't zone out?

	▲	confidantlake 15 minutes ago \| parent \| next [-]
		Try going for a walk when listening to an audiobook. When I do that I rarely zone out. When I don't I nearly always zone out.
	▲	colechristensen an hour ago \| parent \| prev [-]
		The speed helps with that. Also doing something mindless helps. The dishes, the laundry, moderate exercise. I can't pay attention to most audiobooks at 1x, I get bored between words.