Limiting your studying to the night before the exam rarely produces satisfactory results, no matter how much time you spend on it. Your goal should be to review your notes carefully and thoroughly at least three times, on three separate days, prior to the exam. If you do so, you will find it much easier to remember the material covered. Ask questions if something is not clear to you. I find that it does not work very well to respond to individual questions during a lecture in a large class.
Most students are bored by the process and feel that their time is being wasted.
I am glad to answer questions before or after class, but the amount of time available will be limited. If you want to speak to me in person but my scheduled office hours are not convenient for you, I will gladly arrange to meet you at some other time. This will put your question at the top of the priority list when I answer email. Note that when I post the questions, I will remove all information that could be used to identify the sender. Please note that if you have questions about your grade, you must see me in person.