Most SPM candidates assume that formulas will be provided during the exam. Yes, formulas are provided but usually just the basic ones. Often, the formula list provided in exams are incomplete. There’s always something missing such as labels etc. That is why you need to know your formulas and each subject accurately, i.e: Physics/Chemistry/Additional Mathematics and Mathematics.
It is extremely important to memorise those formulae, so you don’t end up getting all of it jumbled up. Equip yourself with these Useful SPM formulas and easy guide on how to use them.