@vrl hello. Taxation law is under optional but business law is a mandatory subject. Meaning, kailangan positive ang assessment mo sa business law para hindi ka na mag take up ng additional subject. Anyways, dito sa forum natin dito, wala pa naman ako nabasa na nirequire magtake ng additional subject whether cpaa or icaa nagpa assess. As long as properly supported ng syllabus all mandatory subjects mo, tingin ko naman magiging positive ang assessment mo. Good luck!