I haven't prepared for it yet.
Составьте все виды вопросов.

I haven't prepared for it yet

Have I already prepared for it? (yes or no (general) question)

Why haven't I prepared for it yet? (why have I already prepared for it?) ( ,,WH,, (special) question)

who hasn't prepared for it yet?

Have I already prepared for it or not? ( ,,or,, (alternative question)

I haven't prepared for it yet, have I? (tag (disjunctive) question)