I made it through college with a combination of cramming and bad sleep habits, but focusing on spaced repetition, the diffuse/active modes, and sleep has made classes I've taken since feel like easy mode.
And that a killer presentation can even get you trust from people that you shouldn’t even be getting, bypassing what may otherwise have been great difficulty to earn their trust.
I think developing a love for reading is really important. I'm not a big reader, but I can usually finish 20+ books a year, half of which are beneficial beyond enjoyment.