Speak pure Mandarin with Chinese classmates / friends, i.e. no mixture of any other spoken language. Listen to Mandarin speaking native speakers from TV educational programmes. Write in full Chinese characters, not hanyu pinyin. Preferably, learn how each Chinese form, e.g. by number of strokes in each phrasal word; discover some interesting ideas for writing from China paintings, poem, or any other favorites. Listen then read then speak then write.
