Before June, I need to get the next pieces: - 4 songs of Bartok For children. - Haydn Sonata XVI no 17 (at least the first 2 movements)- Chopin Nocturne C sharp minor - Gavote of Manuel M Ponce I have played them since December, but I am still making mistakes, and I only have the first movement in the Haydn Sonata. I am not sure what is wrong in my studying method, I started slowly With hands separated then together, at a slowly speed.What could you recommended me?