Education Credits for Refund

My son is a full time college student. This is the first year that he files tax return as an independent taxpayer. His return shows that he has a total deduction of $16,400 which includes a Standard Deduction of $12,000 and a Tuition and Fees of $4,000. It also shows that he has a credit of $1,800 from the Recovery rebate credit and this $1,800 becomes his refund. TurboTax shows that he is eligible for all 3 education credits. Should he get refund from the Tuition and Fees of $4,000 or the education credits? Thanks very much!