Like rubbish
Wrong explanation leads to unexpected catastrophe
Response from developer
Thank you — you were right to flag this. A wrong explanation is the one thing a prep app can't afford, and your review is what sent us looking. We've since re-checked every question in the bank: solving each one independently, then re-deriving every step of every solution. Where an explanation was wrong, cited a rule that doesn't actually exist, or pointed at a handbook page we couldn't verify, we fixed it — or removed it rather than leave a guess in its place. That's in this update. If you hit anything else that's off — a step, an answer, a reference — tell us and we'll correct it. Getting these right is the whole product.