What do you do on a constructed response question when you are unsure of the answer? Curse yourself for not studying harder? Or do you bloviate?
[verb] talk at length, especially in an inflated or empty way.
I realize that you may have been coached to prattle on and on when you do not know how to answer a given written prompt. The thinking is that if you blather enough about any given topic, you will eventually hit upon some kernel of truth.
Even a blind squirrel finds a nut once in a while. However, luck does not make hime a master forager.
Would you answer a, b, c, and d on a multiple choice test? After all, one of the choices is correct? Isn’t that what you’re doing when you prattle on given a writing prompt?
Stop throwing spaghetti at the wall and seeing what sticks. The right first choice is reading, practicing hard, and reviewing for an exam.