I have the same problem. I finish with time to spare on the LR and RC. I think it's just a reading speed thing for me, I read pretty fast, so even the parallel reasoning questions with really long answer choices don't take all that much time. I've found that if I force myself to go a little slower, I still finish with extra time, but miss fewer questions.
For the games section I recommend the bible, as a starting point. Some of their suggestions seem a little cumbersome. The main thing is PRACTICE, and learn your own system, LGB will help give you a good system to work from but don't follow it to the letter.
The other problem I had with the games section was getting bogged down on one question. If it feels like I don't know HOW to answer a question right away I skip it. Usually, when I come back to it later, the answer is a lot easier to find. (Maybe that's just me; if it weren't for the time limit I would actually enjoy the LG section).
Does anyone else wish they would just give us the whole test as one section, so that we could play off our strengths on the time? If I could use the extra ten minutes I have from RC and LR on LG, I would get a much better score