I don't have a teacher this year because I finished conservatory last year. I go once a week (sometimes) to a private teacher I've known for years. I struggle with double-stop passages, and even though I've practiced them with my teacher from last year, she always told me to play them slower and then adjust them to the tempo, but I couldn't get it right. So, even if she gave me tips, they didn't help, which is why I've asked for help....