Are regional variants of Tagalog going to hurt my progress in official certifications?

I’m an exam-focused learner preparing for a proficiency test. My tutor from Batangas uses a lot of specific regional verb conjugations and slang that I rarely see in my textbooks. Do standard Tagalog exams penalize you for using these local variants, or is it better to stick to 'Manila Tagalog' for the sake of the test?