Discover is a bit stingy. If you don’t have a credit record, even if you can get through the limit, the limit is usually not high. I had a good record in Citi for two years before I applied for Discover. My TransUnion report was asked for 729 points and my income was listed as 22,000, and I was approved for $1,000. Just write it based on your tuition + living expenses, 50K is enough. But it doesn’t matter if it’s more, since his family won’t check anyway.