The criterion for acceptance into the school is the willingness to put in the effort to achieve full potential rather than high 'innate' ability. Placement into classes is determined by academic attainment, with age acting as a limiting factor. Students applying to enter any class must take diagnostic tests to determine their placement.
Students who are found to be behind academically are rarely refused. Instead, they are offered, at an extra cost, one of several solutions depending on the severity of the academic problem. These may be:
1 - Summer school: A six-week summer course offered in June, July, and August. Students who are academically below the required standard can attend this course and often make up for a whole academic year.
2 - Special lessons: A student found to be weak in one subject attends extra periods in that subject until the level of the class is reached.