- A is incorrect because you need the brain to be comfortable wiht the information you in take for quite a bit
- B studying alone is good . because you can focus on what you must complete. But yet again working with someone is also beneficial because you can learn from them
- C is quit true because when you handle the hardest part and memories it and it won't be hard for you to recall.
- D can be correct if you know what you are doing
So in my opinion i think the best study tip is B and C