There is one section in which many students have difficulty for the intonation in Wohlfahrt 60 Studies no.46 in A Major.
As I’m playing in the video, you can work slowly one beat per bow. After you get comfortable and confident with your intonation, you can work on the slurs as printed in the music.
I do not mind you play entire study with slurs of every 2 beats (= two triplets ) , so that you can produce good sound.
Happy Practicing !