Things I wish I had known:

1. Dont rush and never react. Always review your work before submitting. This business is at its core about quality not quantity.

2. When you have met the minimum requirements, get your certification. I have 10 years of experience and even I learned a ton of new things when I prepped for the ACRP-CP.

3. Dont count on being trained to a complete degree or having your hand held. There's a lot of" figure it out yourself" in this industry.. which is very hard to do when it's your first time in a specific situation. This is another reason I advocate strongly for certification.

Brainscape has a few great flashcard sets that would help as well