20分!!急!!!英文自我介紹

I do not know you, so I only able to give you some hints.
You have to tell them why they should admit your application.
For example, you are good at computer. You also have to give them a real example to show you are good at this area.
Also, you should show them you are willing to learn and would like to do the computer job after your graduated.
For example, you can say something like you spend most of your free time to learn the computer software and your dream job is working at Microsoft. If you won any competition related computer, you should highlight it during your interview.
Hope it helps.