I recommend you to learn basic programming language, one my friend did MS in sta... who also completed MS on same subject in Nepal but it did not help him much most project works based on software application.
Regarding linear algebra, calculus 2,3 those are undergrad course works and it does not count to your overall GPA ,if those are prerequisites specified by your department just take it and pass not need to think too much.
Try to talk with your seniors from you school who pursuing similar degree at USA does not compare with australia and europe its totally different. Talk to right person get straight answer and make a plan.
Let me know if you need any assistance.