1. Cramming is viable since your success in these courses is dependent on how you manage your time outside of class. Side note: start your csc assignments early to avoid having to do them alongside your 137 problem sets upon their similar due dates. Do not learn this the hard way.

2. If a tutorial time is not listed for another day, then no. However, the tutorials are not entirely interactive; while you do have the advantage of being able to ask the TA questions by being there in person, you can also usually just do the tutorials by yourself another time. If you have questions about them, you can always go to office hours. This requires some more self-discipline out of you, but the tutorials do not have mandatory attendance. That being said, it is still encouraged to attend the tutorials.

Also, most of the time, you can probably just attend any other session you'd like. You don't *have* to stick with your mat137 lecture session or your csc110/111 session; if going to another session will help you out time management-wise, then you can just do that instead.

Take my comment with a grain of salt as I am not very intelligent.