You need pink, red, white, and baby blue:)
First paint your nails white:) I did two layers.
Now do some parallel blue stripes. You can use a paint brush if your nail polish brush is too thick. Just clean it in nail polish remover as soon as you are done:)
Now a pink stripe as shown:)
Now draw on an "A+" and you are done:) my red is a bit old and sticky, so it's a bit harder to use. Recommend fresh polish ;)