You covered fractions in October. It is March. Do they know fractions? Most homeschooling parents genuinely cannot answer that, and the not knowing is more uncomfortable than any actual gap would be.
Finding out does not require testing in the formal sense. It requires asking a small number of questions, some time after the teaching, and being willing to accept the answer.
Ask later, not at the end of the lesson
Checking understanding immediately after teaching measures short term recall, which is nearly always good and tells you very little. The useful check happens weeks later, when whatever was going to fade has faded.
This feels counterintuitive, because a check straight after a lesson produces flattering results. That is exactly why it is not worth running.
What a useful check looks like
4 things to do
Ticks are for this visit only. Nothing here is saved anywhere.
Four honest results, not two
The temptation is to conclude either that they know it or they do not. There are really four outcomes, and the fourth is the one most systems refuse to report.
It looked solid, so move on. It is worth another look, so revisit it. It is mixed, which usually means more practice rather than reteaching. Or there is not enough to say, because they answered two questions and you cannot conclude anything from two.
Not enough to say is a real answer
If a child answers three questions and gets two right, that is not sixty seven percent understanding. It is a sample too small to mean anything, and reporting it as a score invents confidence that does not exist.
Any tool that turns three answers into a percentage is lying to you politely. The honest response is that you do not know yet, which is genuinely useful information because it tells you to ask again rather than to act.
The questions that ask them to explain matter most
A child can produce a correct number without understanding anything, particularly in maths, where a memorised procedure gets the right answer for a while and then collapses.
The questions worth including are the ones where they have to say why. There is no single right wording for those, which is exactly why no answer key can mark them and why you are the only person who can judge it.