The school I go to has up to ten students per class.
Because of this low teacher to student ratio, it is possible for the students to receive detailed instruction.
ご質問ありがとうございます。
"The school I go to has up to ten students per class."=「私が通っている学校では、1クラスに10人までとなっています。」
"Because of this low teacher to student ratio,"=「一教師あたりの生徒数が低いため」
"it is possible for the students to receive detailed instruction"=「きめ細かな指導を生徒たちが受けることは可能です。」
ご参考に。