How about 輕鬆學鋼琴1,2,3, John Thompson‘s Modern Course for the Piano (the first grade book),First Lessons in Bach For the Piano,Hanon The Virtuoso Pianist in Sixty Exercises For The Piano,Czerny Practical Method for Beginners on the Pianoforte Op. 500? Here altogether 7 in total for pre-beginners / beginners.