Professors want you to do well. Their goal is not to single you out to fail you. It is your responsibility to find out what you don't know. The best way to do that is by speaking to the professor in an uninterrupted space. Block out an hour of time so you don't feel rushed.
Many students think that it is cool to cut classes just because they can... This is ON THE JOB training. Would you want to drive across a bridge built by someone who missed the lecture on concrete structures? even if you get "most of the material" it could be what you missed that means someone loses their life.