We can tell how an amino acid will be classified (as polar or non-polar) by looking at it to see whether 

1) it has a hydrocarbon chain or ring in its R-group; this will make it insoluble in water (and thus non-polar).

2) it has a charge (- or +) in its amino group; this will make it non-polar.

3) it has an electronegative atom (like oxygen) in its carboxyl group; this will classify it as polar.

4) it has a charge (- or +) in its R-group; this will make it polar. 
Additional Requirements 

Level of Detail: Only answer needed 
Other Requirements: There could be more than one correct answer(it is ok), it a multiple choice (choose all) question