The math scores in ontario are declining. That's bad. It's also important to note that internationally, Ontario students are still doing better than most places in the world.
It's not the fault of the liberals. Discovery math originated under the conservative Harris government so let's take the politics out of the discussion.
It's not the fault of discovery math either.
The problem is how the math is taught and perhaps partly due to the teachers not being effective at teaching in that way.
Take the best of old math and put it with new math and make sure teachers have the training they need and the resources they need.