Does it say what credit you need Schedule 3 for? A common one is the retirement savings credit. If you just want to forget getting that saver credit due to the upgrade to Deluxe, you can tell the software in My Info that you were a student and it will disqualify you for the credit and let you use the Free Edition.
To not upgrade because of the retirement savings credit see this thread
https://ttlc.intuit.com/community/retirement/discussion/do-i-have-to-upgrade-because-of-retirement-s...
here is Schedule 3 to see what it covers
https://www.irs.gov/pub/irs-pdf/f1040s3.pdf
