Kayser's 36 Elementary and Progressive Studies for violin  has become a staple etude book for beginning violinists. 

Dotzauer Exercises for Violincello Book 1 is an incredible exercise book for cellists. It is a classic and fundamental for all serious cello students. A must have!

The Wohlfahrt 60 Studies Op. 45 Volume 1 and 2 are a mainstay of violin study. 

Klengel Technical Studies for Cello are Great technical exercises for the high school cello student! Volume 1 covers scales and arpeggios in two, three, and four octaves. The scales are also presented in broken thirds, and with multiple bowing patterns for well-rounded practice. This item is a Schirmer edition

Mazas forty selected studies consist of technical methods for young violin students. 

Dancla's 36 Melodious and Easy Studies  for the violin are perfectly suited for young beginners after the second year, but are also appropriate for adult players.

Melodious Double-Stops for Violin is a Method book Composed by J Trott and Josephine Trott.