Yes. Student dependent visa holders can take courses with Galaxy Training Australia, provided they are meeting their visa conditions.
For more information on your visa condition, please visit the following -
Conditions that might be attached to your family members
|8201||All family member visa holders who are over 18 years of age||You cannot study for more than three months while in Australia. This condition applies to student dependent visa holders who were 18 years of age or older when the visa was granted.|