Please visit the following website and play this letter name identification quiz. Click on the correct link depending on your grade and instrument.
5th Grade
Violin: https://www.musictheory.net/exercises/note/bdxyrytsrm1yyyyyry
Viola: https://www.musictheory.net/exercises/note/rjiyrytsrm1yyyyyry
Cello: https://www.musictheory.net/exercises/note/neuyrytsrm1yyyyyry
Bass: https://www.musictheory.net/exercises/note/njuyrytsrm1yyyyyry
6th Grade
Violin: https://www.musictheory.net/exercises/note/bduyrytsrm1yyyyyry
Viola: https://www.musictheory.net/exercises/note/rfiyrytsrm1yyyyyry
Cello: https://www.musictheory.net/exercises/note/nruyrytsrm1yyyyyry
Bass: https://www.musictheory.net/exercises/note/nguyrytsr51yyyyyry