Essay writing is a learned skill, and something any student can master. This can either be done independently, or with the help of a tutor.
While writing an effective essay can be difficult at times, it is easier when you plan in advance and break it into small steps.
Monash University provides helpful writing tutorials for students. While the tutorials aim university level students, they are just as effective for high school aged students.
Visit the Monash University's Language and Learning Online for more information.