You should work on this resorting to your dictionary when in doubt, or just undertaking corrections if you notice the mistake.
The grammar should also be checked. You can consult a grammar book if in doubt or just make the necessary changes if you notice a mistake.
This implies working on the register of your paper- formal or informal- and also this will lead you to check on collocations. For example, in English the word decision collocates with make.
