Formula tested in Exam

As there wont be any formula sheet…do we have to memorise those “complicated formula”

e.g. Excess kurtosis …and will they be tested as calculation in exam?

i have concentrated on formulla of excess kurtosis for 100 or larger sample… it represents the concept and easier to remember. personaly i wont suggest to spend the precious little time we have on remembering equation 18 rather focus on concepts…