Not sure why someone would recommend FMP11 for your case, but the lead on portals (or more generally Related Tables) is spot on.
Look through the help and learn about related tables.
Further, look through this intro primer: www.foundationdbs.com/Downloads/WhitePaperForFMPNovices.pdf
I'd need more info about the details, but it looks like you would need a Student Table, A Subject table and an Assesment table set up as Parent-Child-grandchild with one to many relationships. Depending on how you'd like to review the data in the future, a many to many relationship with a join table may suit your needs even better.
Look though the WhitePaper, grasp the concept of related tables, play with it a little bit and then post back...
Without this basic understanding of related tables, we're all going to be speaking greek to you.