One of my favorite exercises for practicing my recollection of a language are word puzzles. I like all varieties, from crosswords to word searches to pictograms. To me, having them makes the banal task of memorizing and vocabulary building a lot more entertaining.
You can find word puzzles to help learn a language online. In my searches, I’ve found interactive online varieties, as well as old-school word puzzles that you can print out and do by hand. Of course, these pre-made exercises can vary up and down the scale when it comes to level of difficulty and focus, so you might have a bit of a hard time finding one that suits your existing skill level.
A better option would be to check if one is available in your learn a language software. After seeing many of these foreign language training programs, I know a lot of titles that do offer those, with some containing better exercises than others.
So far, my favorite has been those learn a language software that generates crosswords and other word exercises on the fly, using the lessons on the sections you’ve already finished. With these, I can literally do word puzzles over and over. Since they’re dynamically produced, no two sessions are exactly alike, making for a good amount of variety.