I am a first semester master's student. A professor has sent me an e-mail with an offer to tutor a bachelor class (this would be a paid job). I do not know him personally but he told me in his e-mail that I was recommended to him by a professor whose class I took this semester.
Now here is the conflict: I did my bachelor's at a different institution and in my country, it is normal for universities to require students who switched institutions to take 1-2 bachelor classes in the first semesters of their master. Among the classes I am required to take is the very same class the professor offered me to tutor. As a tutor, I would be teaching exercise classes and grading other student's solutions to the problem sets.
Can I decline this offer for the above reason or could it be seen as making excuses? I do want to pursue a career in academia so I am afraid that this could be misunderstood as me not being willing to tutor classes or do work for the deparment in general.