The APA Dictionary is a good resource if you can't find the definition of a vocabulary term in your textbook. This website has official definitions from the American Psychological Association.
If you aren't a very good test-taker or just want to find better ways to study, check out this video series on YouTube about effective study strategies: https://www.youtube.com/playlist?list=PL85708E6EA236E3DB
There is also a Crash Course series devoted to study skills: https://www.youtube.com/watch?v=IhuwS5ZLwKY&list=PL8dPuuaLjXtNcAJRf3bE1IJU6nMfHj86W
The "Learning Scientists" blog has various posts about evidence-based teaching/learning strategies: http://www.learningscientists.org/blog/
>>This article, in particular, discusses "retrieval practice," which is involved in studying and committing information to memory: http://www.learningscientists.org/blog/2016/6/23-1
The document below contains many helpful tips for managing study time.