It seems normal for teachers to teach in a classroom setting with one standard for all pupils. It is normal BUT is it RIGHT thing to do?
Every student has very different lever of understanding of a subject and also students need time to absord after a subject is being taught. Therefore, allowing students to learn at thier own pace is indeed a way to effective learning.
I encounter a case in KK that a student, Jason, has reading difficulty but his mother is not awared of his learning deficit, and all along she thinks that Jason is lazy and having no interest in study. However, after I show her that Jason is unable to read some very simple characters, then she accepts the fact.
Then I go on encouraging Jason to do 2 sets of paper with 15 questions and with my help of reading out the questions and suprisingly to his mother that Jason scores 80%. For Jason, he is also overwhelmed of how well he performs.
Therefore, allowing students to learn at their own pace is the way to effective learning.