Some of the most important qualities of academic writing are identified below:
Focused and relevant
Structured and predictable
Logical and connected
Reasoned and supported
To achieve a piece of writing that demonstrates all of these qualities takes time, practice and effective use of feedback. Learning how to write academic assignments is a goal and not a starting point for most students.
In academic writing the style of language used is usually formal. Some of the formal aspects of academic writing are outlined below. There may be ways of writing which are specific to the subject you are studying as well.
To make language more formal: