Coskweness measures the skewness of one variable with respect to the other variable,while in the skewness we measure whether the variable is positively or negatively skewed,in coskewness we find the relative skewness that is whether the variable is positively or negatively skewed with respect to the other variable.
Similarly the Coskurtosis measures the peakedness of one variable with respect to the other variable,while in the kurtosis we measure whether the variable is peaked(over>3 or under<3 kurtosis),in Coskurtosis we find the relative kurtosis that is whether the variable is over or under peaked with respect to the other variable.
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The curriculum has changed since 2013, so you want to make sure you are studying and understanding all of the concepts in the current GARP curriculum. Our exam feedback threads in the forum may also give you an idea of the concepts that have been tested on the past few exams.
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