That job thing really bugs me. You can bet he is getting more ammo. I like Kat's reply because it shows you are looking for a job that you SHOULD be able to get, but due to being out of the workforce because of taking care of your kids (which he and you agreed to while married) it isn't going to be quick. In fact, maybe something like this:
I'm exploring my field of study and working on getting a job based upon my background/education, but due to being out of the workforce taking care of our kids, it is going to take awhile. I'll always remember how we knew that was the best thing for the kids, and I'll never regret it. It's too bad the divorce has to change what we always thought was the best interest of our children. Thanks, anyway, though.
My take on the reason he didn't let you know about your kids' grades is because it is just going to show that homeschooling might be a better place for them, and he doesn't want that.