We offer two daily mailing lists - one for grammar and one for kanji. Each of these further has multiple sub-lists which cater to different skill levels. You can sign up for as many or as few as you would like and managing your subscriptions is quite easy - there is a link in every email you will receive. To get started however, there are three separate signup pages:
Sign up for Both mailing list(s)
Sign up for Kanji a Day mailing list(s)
Sign up for Grammar a Day mailing list(s)
Here's part of an example of what you get in your email (it has a pretty format that can't be replicated here):
Meaning: because, as expected (used for positive things)
Example: the food was good as expected
They offer more explanations in English, and several examples such as these:
Impressive as expected from training every day - amazing strength.
That restaurant has a good reputation, and as expected the food and service was great.
Also, the whole page can be viewed on Popjisyo and Rikai, so if you're stressing out about the kanji, you'll be able to read it easily.
At this point, I don't even know if I'm going to pass the test because I looked at some sample tests this past week, and in spite of the reading and studying I've been doing, I didn't know all the vocab. Which means December will be trouble for me.