It is not a easy decision. 0 S+ ^5 d& P1 G2 ]" D + L4 J$ Y9 A7 P w& I3 ~8 R* E9 wIf I were you, I do not reject this offer for now, ask the possibility to do a part time supervisor.
first, congrats on the supervisor offer. second, you need to make your timeline more clear: are you planning to do BBA right after diploma (so in april)? or will you be doing BBA in september?