The Trustee, Presidential, NMF Presidential, Mork, and Deans are all 4 year scholarships. Many other scholarships, like ones offered by USC Schools, may also granted for 4 years. Some specific awards may need to be renewed.
There used to be conditions set that these top $$ academic merit scholars needed to satisfy to continue to receive their merit awards. In the past, the criteria included maintaining a 3.0 GPA and taking a minimum of 16 units/semester in order to graduate in 4 years (5 for BArch students).
I see the USC website no longer lists a minimum GPA standard and wonder if that means they have removed that specific condition. Anyone here know? Here's the current website: USC - Mork, Trustee & Presidential Scholars: Renewal & Probation Policy