To become a more efficient reader, consider the SQ3R method (survey, question, read, recite, review) to help you retain more without having to reread so often.
Most graduate students find themselves with research responsibilities, and for many this may be the first time they're given the opportunity to help run a lab.
One key to being successful in graduate school is to be productive. However, for many this is easier said than done, so a few suggestions are in order.