also juniors if the third year should be included

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Note added at 5 mins (2015-06-08 13:48:08 GMT)
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variant: freshman and sophomore university students

IMO

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Note added at 10 hrs (2015-06-08 23:52:28 GMT)
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Transcript. 1. Task-based Writing Activities For Lower Level University Students Wes Lang Osaka Shoin Women's University
http://www.slideshare.net/wescamus/taskbased-writing-activit...
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Cooperative Learning and Learner-Centered Projects for Lower-Level University Students.
http://eric.ed.gov/?id=ED437847
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in order to investigate these factors on lower-level university students. (n=40), participants were given a questionnaire in which they self ...
http://digitalcommons.iwu.edu/cgi/viewcontent.cgi?article=20...
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- Negative attitudes towards language learning held by lower-level university students are challenging for teachers, especially when students ...
http://www.besig.org/events/conferences/pce/2015_Manchester_...

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The challenge of introductory finance courses often surprises junior level university students.
https://www.google.com/search?num=100&espv=2&q="junior level...
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marketing research firm, is pleased to announce its annual Ladd Research Group Scholarship for Junior-level university students interested in pursuing.
http://local.cincinnati.com/communitynews/Anderson Township/...

That's what first and second year university students are called, collectively, in English.

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Note added at 1 day13 hrs (2015-06-10 03:00:55 GMT)
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I don't know why they don't just say university students, since upperclassmen + underclassmen = all of them.