Feeling really stupid working through codingbat java warmups. The only way to get better by doing more?

I ended up taking a lot of time off from learning, and now am just trying my hand at java learning via Pluralsight trial that I got by signing up for Dreamspark, before I start school in January.

I'm very much a beginner, but having way more fine trying these little puzzles than learning from videos and books. That being said, I'm wondering what you recommend in the way of reading to help wrap my head around the problem solving.