Tell them what you can bring that is unique, things like sports, experience, morals, ethics, languages, hobbies, if your good at managing your time tell them. If your there to purely study say so, but put nice words in like determined, assertive.

Be honest because otherwise you will be caught out, but remember to make it sound like you are bringing something that very few others can. Use words like responsibility, open-minded, and team worker as these will show have life skills and what is sometimes called soft skills.

Good luck with it.

How you start the sentence depends on how the rest of application is laid out. One examples is:

“If you accept me as a student then I bring a wealth of experience and talents such as ……”

Good luck. I hope i helped.