Here are the ArchiCAD system reequirements:
http://www.graphisoft.com/support/system_requirements/index.html
If your computer match them, you should be fine. You will probably not be working with very large model (I guess) on your school projects so you will need to consider only the recommended configurations.
There is also an article about graphics cards:
http://archicadwiki.com/VideoCardsForArchiCAD17
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