Those are two really good words. It really has you think on what Kanji is supposed to be there. Maybe you should quiz yourself by getting a whole list of 交ぜ書き words with the Kanji in question missing. Then, it would be your job to show what Kanji goes where. With it being out of context, you may want to put in contexts of an example sentence...working on grammar and vocab at the same time. 
For example
Here are Kanji that I've been looking at in the past hour. 乖、云、于、也. There's more, but these are the easiest ones. I've known them for some time, but I wanted to learn or refresh myself on vocabulary with them.
So, what I would do is find words that have them in it. Some that I have found include
単于
云為
乖離
可也 ← FWI...I knew this one at list.
于蘭盆会 ← The unabbreviated origin of お盆
云々
乖(そむ)く
乖戻
I really wish I could find more words with 乖. Something tells me the one word I don't know with it in it is going to be what I face on the Kanken in the not-so-distant future.
Anyways, whether it be a definition or sentence, I would wait a while, maybe an entire week before actually doing this, take out the pre-made sheet of these words and the context without those said Kanji. If I can figure them out, that's good. Review anytime before that wouldn't be a bad idea, but it would be really good for you to find out what your limit of instantaneous memory can last you. Eventually without ever seeing a word like 云々 for months, you may end up forgetting it.
I don't know if this tactic would be helpful, but it's worth a shot.

For example
Here are Kanji that I've been looking at in the past hour. 乖、云、于、也. There's more, but these are the easiest ones. I've known them for some time, but I wanted to learn or refresh myself on vocabulary with them.
So, what I would do is find words that have them in it. Some that I have found include
単于
云為
乖離
可也 ← FWI...I knew this one at list.
于蘭盆会 ← The unabbreviated origin of お盆
云々
乖(そむ)く
乖戻
I really wish I could find more words with 乖. Something tells me the one word I don't know with it in it is going to be what I face on the Kanken in the not-so-distant future.
Anyways, whether it be a definition or sentence, I would wait a while, maybe an entire week before actually doing this, take out the pre-made sheet of these words and the context without those said Kanji. If I can figure them out, that's good. Review anytime before that wouldn't be a bad idea, but it would be really good for you to find out what your limit of instantaneous memory can last you. Eventually without ever seeing a word like 云々 for months, you may end up forgetting it.
I don't know if this tactic would be helpful, but it's worth a shot.
