I turned off tones and definitions after a while. Now I just study writing and reading. I mark the reading wrong if my tone, definition, or reading is wrong.

You can simulate this: Go to your account and tick off the other 2 categories, save. Then you might go to the iOS app, double click the green plus sign and load new vocabulary, let say 20. They are almost coming in a row. Once they are all loaded (and it will only load for writing and definitions), then go back to your account and tick again all 4 categories. Skritter will tell you, that it will not do it retro-active, but you can tick for which list this should apply. Don't let it apply and hit the button "Leave the lists as they are". Then you have the effect you wanted - but not very elegant.