Practice reading and learning the treble clef daily, in small increments.
Often times the hardest part is differentiating the treble clef from the bass clef. Because a note on the bottom line in the treble is not the same pitch as a note on the bottom line in the staff, it can get confusing. Think of it as compartmentalizing when learning. Label the compartment in your brain “treble clef” when you’re learning treble clef. When you switch over to bass clef, think of it as a separate compartment labeled “bass clef”.
Always spend more time on what is most challenging, and soon it won’t be challenging anymore! Practice on a daily basis, even if you only have five minutes. Studies have shown that smaller, more frequent, increments of practice or study are often times more beneficial than cramming it all in the day before your lesson. Be patient with yourself, do your homework, and before you know it you’ll have mastered the treble clef!