Mrs. Wopsle is Mr. Wopsle’s great aunt. She is kind of wobbly. Her educational methods are basically non-existent. She seems to have no direction and no actual idea of what to do.
The pupils ate apples and put straws down one another's backs, until Mr. Wopsle's great-aunt collected her energies, and made an indiscriminate totter at them with a birch-rod. (Chapter X, p. 51)
Mrs. Wopsle wobbles because she is unprepared to be in the position of teacher. She falls asleep, and the pupils begin studying who can step on someone else’s boots harder. Biddy seems to be the only one who really cares if any of them get an education. Needless to say, Pip learns nothing here.