I go to CSU right now and you absolutely don't have to worry about these things. Pharm and anesthesia are both introduced in our second year curriculum and there isn't any expectation for you to know anything about them when you enter vet school. We slowly introduce some very basic concepts throughout our first year classes (for example, what pathways NSAIDs act on) and it's taught to us with the expectation that we've never learned it before (aka it'll be fine
).
We have a huge variety of backgrounds and levels of experience within our class and the curriculum doesn't assume any base set of knowledge except for the prerequisites we were required to take to get in. My class has also been exceptionally helpful and eager to help out any classmates who are struggling, don't have as much experience in a certain skill or subject, or who just want to hear a different perspective on something.
I will also add re: surgical skills other than anesthesia that our main surgery professor is a really nice guy and that the way our surgery curriculum is set up is to ease us into things and make us feel as confident as possible in our skill development throughout school. Don't be intimidated!
If you're still interested in learning more about it during first year, poke around some of the clubs. I know quite a few offer fun and educational wet labs relating to these subjects and at least one club has a wet lab where they go over parts of anesthesia machines and helps you learn more about what they do before you formally learn about it in school.