The Melodic Minor Scale is is similar to the natural minor scale but has a raised 6th and 7th scale degrees when ascending and then are flattened to return to the natural minor scale when descending. The organization of whole tones and semitones in an ascending melodic minor scale are in the following order:

Practice singing the melodic minor scale using a strategy of your choice.  Three strategies are provided below. The Movable Do solfege system uses the singing syllables starting on La (the sixth scale degree of the relative major scale), the Scale Degree system uses numbers and the Fixed Do solfege system has the first scale degree considered as Do.   

Practice singing the melodic minor scale in different keys using the system of your choice.