Honestly, I would just enjoy your summer! There is a lot of information that will be taught, but if you stay caught up in the courses it is very doable. There isn't any reading material that I know of that they recommended to read beforehand...I think the best advice I can give you is start out with everything you have and really fine tune your studying habits to optimize your studying time. It is a lot easier to cut down your study habits because they are getting the results you want than trying to work your way up to several hours of studying in the middle of the semester.
I'm not aware of any tuition changes, but I don't think it would be unfair to guess that if they were to go full remote next year that the rates would change.
As for studying, I think what has benefited me the most is pre-reading for lectures (ie looking at the slides/syllabus beforehand and really trying to digest the concepts) and then going into lecture with questions in mind that allows you to follow the lecture actively. I don't know about you, but during undergrad I did not take advantage of my lectures. I would go in, passively write notes, go on social media, and message my friends, but I was there so I thought that's all I really needed until the exam came up and I had to teach the material to myself all over again. In MAMS, I took advantage of lectures as being my second exposure to the material making my study time much more efficient. If you're sitting in a 1.5/2 hour lecture you might as well take advantage of the time! That being said, I know several people who do not benefit from sitting in live lectures simply because that isn't how they best learn. So, my next biggest study tip is study efficiently. Find what works for you, and be honest with yourself. If you like Anki and massive amounts of flash cards, that's great, do that! If you're more like myself and benefit most from writing out notes, write all the notes you desire and use up dozens of Muji pens while you're at it! Find a good rhythm of how you want to use whatever technique you choose to your advantage, and make sure you are doing it intentionally and not just going through the steps to get done. This isn't for everyone, but my way of going over each lecture is to go through material 4x (this isn't in one sitting, rather throughout the weeks with other lectures staggered in): 1. preread lecture (usually the night before), 2. lecture with active listening and note taking, 3. detailed notes outside of class on the material, and 4. a final review, and by that time I am pretty well versed and ready for the exam.