A recent survey in the US shows that a high percentage of school kids complain that school is too easy, and therefore boring. At the same time, a high percentage of kids have trouble at school. I don’t know if it is the same kids or not. I suspect that the same number kids would have trouble even if the course of study were made more demanding.
I can only speak about what I see with my grandchildren who are in French immersion. I find the courses far too easy, and poorly organized. If I look at their homework, a lot of it looks like make work tasks created by teachers, often on poorly presented photocopied hand outs.
In language instruction, as I have said, there should be far greater emphasis on increasing the passive skills, the vocabulary and the comprehension skills, rather than worrying about teaching correct grammar. Because the kids, other than those in French immersion, are graduating after 10 years of regular French, unable to string a proper sentence together.