Attendance might be compulsory at your university. At mine, for my course, you don't have to attend lectures (but they're rarely recorded and slides are often brief), whereas seminar attendance is monitored and you're brought in for a meeting if you miss more than a few/without reasonable circumstances.
But even if none of your attendance is monitored, I'd be very concerned about repeatedly missing the contact hours for the same modules. If you could change the days you miss of university each week then it might be okay, but if you're always missing one module's lectures and seminars you're potentially going to struggle with it overall. Even if you find the content easy, you don't necessarily know what you're missing, e.g. in one lecture, a tutor unofficially explained the topics that were going to be on the exam, information that otherwise wasn't provided.