Maimonides covered not only not only the laws stated in or implied by the Torah, but also provisions he believed necessary to implement them. He wrote, for example, that it was mandatory for every town to establish a school. (He meant a school for boys. Typical of his time, he believed that women were exempt from the requirement to study.)
He also wrote that a teacher is required to continue teaching a subject until all the pupils understand it. In modern schools, we call this learning for mastery, but we apply it more to skills, such as multiplication, than to ideas. In his view, furthermore, it was incumbent not only on the teacher, but also on the students, to insist on mastery:
Neither should a pupil say “I understand” when he does not, but should keep on asking questions repeatedly. If his teacher gets angry and excited on account of him, he should say to him: “Teacher, this is the Torah! I must learn it, even though my capacity is limited.”
What is most striking in today is the idea that every student, regardless of ability, must learn the Torah, and not only superficially. Maimonides says that the class should stay with a topic until all students understand “the depth of the halachah.” He refers specifically to halachah—Jewish law—because his overriding concern is that every Jew know how to observe it correctly.
Most of us do not share that concern. There are large areas of halachah that do not affect us today: laws pertaining to the operation of the Temple in Jerusalem, including sacrifices; many that pertain only to priests, kohanim; and some that apply only in the land of Israel. Most of these were already in abeyance by the time in which Maimonides wrote. Some are superseded by the laws of the countries in which we live. And there are many that we observe differently, or not at all, because of our own religious principles.
With less sense of urgency about halachah, we tend to see mastery of the subjects taught in religious school, however desirable, as less essential. Although we may press for mastery of Hebrew skills, congregational and community religious schools usually do not strive as much for mastery of Judaic knowledge. We value the students’ total experience of Hebrew school more than mastery of content, and we know that academic pressure would not contribute to the environment that we want.
To some extent, we encourage a culture of low expectations. A high grade in math--really, a high grade in any subject in secular schools--may help a student to get into a selective college. High achievement in Hebrew school won't (unless it's a Hebrew-high program that's accredited to offer courses for high-school or college credit, as in a few cities).
Some congregations use bar/bat mitzvah as an incentive, by setting and enforcing requirements. These standards often strike students and parents as arbitrary and capricious. More to the point, the requirements are almost always for attendance, not mastery: at least three years of Hebrew school, or a prescribed number of sessions of Junior Congregation. If a student has met the attendance requirement, the burden falls on the tutor, not on the student, to bring about a creditable "performance." Neither of the congregations that enrolls students in our school has any school-related requirement at all.
There are exceptions. In regions where state-mandated testing in public schools is especially pervasive, religious schools tend to adopt similar practices, often with respect to Hebrew, sometimes also in other subjects. One school board in such a state asked me, more than a decade ago, if there was an organization similar to the Iowa Tests that we could bring in to test all our students in Judaic knowledge. I worried that, to a student who received a low score, it would feel like a failure in being Jewish.
Thus, I don't think that it would be productive to attempt to raise standards through lots of testing. Nor do I think that the strategy used by some public schools in gifted-and-talented programs--assigning mountains of homework--would be a good idea, even if parents would tolerate it. We rarely assign any homework at all, knowing that parents would nullify the assignments anyway.
On the other hand, it is important that we teach with serious purpose. Although students are not always eager to do real academic work in Hebrew school, they take pride in accomplishment and readily distinguish between making progress in learning and merely marking time. Maimonides says that it is wrong for a teacher to do other work with them or to teach sluggishly. By “other work” he probably meant work for financial gain, but we might also include activities that seem appropriate in school but fulfill no actual learning objective. Teaching “sluggishly” might include teaching below the students’ capacity.
Should students enjoy Jewish learning? Yes! But fun in school is not enough: some of the enjoyment should come from making progress, mastering new skills and ideas, and growing in the appreciation of Jewish life.