Original sentence: A popular measure of progress, especially for children, is external assessment of the progress of the pupil by a regular examination.Another is the graded system of books followed by teachers of the Suzuki method, in which the completion of each book is celebrated, without a system of marking or ranking of pupils.However, the observed correlation between musical and mathematical ability may be inherent rather than acquired.Some teachers prefer other methods of target-setting for their pupils.The most common is the pupil's concert, which gives experience in playing in public and under a certain degree of pressure, without outright criticism or a more or less arbitrary marking system
Edited sentence: An important test of progress, especially for children, is to formally assess the progress of the pupil by a regular examination