It is not a easy decision. 5 ]& f5 h# } C; c6 V ! g& e9 j' ]; x# `6 e* l0 A8 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?