When you compare two independent groups such as males and females on the basis of a dichotomous dependent variable such as "improvement on the social skills" or "doesn't show improvement on social skills" measured at the nominal level, you can use:

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The independent samples chi square test is appropriate for comparing two independent groups on a dichotomous dependent variable measured at the nominal level. McNemar's test is used for paired or related samples, the binomial test is for testing proportions in a single sample, and the one-sample chi square is also for a single sample against a known or assumed distribution.

When You Compare Two Independent Groups Such as Males and Females