Composition is generally not limited by format, but only gives a general theme type at most, such as argumentative essay, prose, etc. The format requirements of official documents are very strict. If there is a format error in an official document, it will be regarded as a "hard injury"; Generally speaking, the composition does not require much language, as long as it is fluent and vivid; Official document is the carrier of transmitting official information. The language of official documents requires plainness, simplicity, solemnity and neatness. It is forbidden to use some exaggerated expressions, and the references are very clear. There will be no ambiguous or ambiguous expressions, and metaphors are rarely used (because metaphors can make different people understand different meanings, even if there are metaphors, they are often some established expressions). In addition, some fixed language expressions often appear in official documents. For example, "building Socialism with Chinese characteristics" and "promoting the development of economic and social sciences and harmonious development". Don't make a mistake or confuse these fixed expression patterns, which will give people the feeling of being a dish.
First of all, according to my understanding, you said you would have an exam tomorrow, so now I suggest you search some official document writing tutorials online, focusing on the format. In the review of mobile companies, you should not be asked to write documents such as "orders" and "opinions". It is estimated that most of them are official documents with a wide range of applications such as "notices". It is good to read more books and prepare more-even if it is not for this exam, you will use it to some extent in your future work. If you don't understand, you can continue to ask questions. Everyone will help you think about it. Good luck in the exam!