XML – Limit the number of sorting results of the for-Each cycle XSL

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I am trying to see if it is possible to have a for-each loop setup in an XSL file that goes through many nodes, but I want to make It only returns the first three results, such as

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< p>Then use a for-each loop similar to the following:

 
But the problem is, if I do something like this: 
< xsl: for-each select = "/course / unit [position()& lt; = 3]">
It will Grab the first 3 nodes and then sort it, which is not what I need, I want it to get the 3 highest marks and return these nodes to display the information, instead of sorting the results after they have gone through all the cycles. I'm sure there is an easy way to achieve this without using templates, so any hints will be very welcome.
Use
< /p>