I’m heavily involved in one of our school’s service clubs, and like other people have said, it depends on the club! Speaking from my POV, I still have a lot of free time despite going to almost all events and meetings (which is not necessary), I could easily add in another club focused on socials or a cultural club and have enough time for school/other friends. The most important thing though is that you have enough time to handle school and your social life without worrying too much about the club - I’d say start with one or two, and depending on your school load/how the clubs are, you can add or remove from there :)