Have fun! No sarcasm or irony intended.
Do your research secretly, but play along. Use the "Bible" study as an entertainment moment or perhaps a study of the mind of cult members. That's what I have done in the last five years. It certainly will be an education that can be useful in the years to come to shield you from propaganda and cults.
I am not asking you to sacrifice your truthfulness. You keep that, but don't waste it, or even harm yourself, by having a candid conversation with an elder.
Just have fun knowing that you know far more than your teacher. However, you want to play dumb, very dumb, and perhaps drag the study to frustrate your "teacher". "Be stupid enough to not understand" and therefore be able to say that you are not ready for baptism, or pioneering, or anything that consumes your valuable time. Just don't play smart. that's not good at this time.