Thanks for your reply. I am looking into amending it. Also I dont think I 'didn't report' stuff. The IRS themselves provided me the option to do what I did.

from https://www.irs.gov/publications/p970/ch02.html

"Coordination with Pell grants and other scholarships. You may be able to increase your American opportunity credit when the student (you, your spouse, or your dependent) includes certain scholarships or fellowship grants in the student's gross income. Your credit may increase only if the amount of the student's qualified education expenses minus the total amount of scholarships and fellowship grants is less than $4,000. If this situation applies, consider including some or all of the scholarship or fellowship grant in the student's income in order to treat the included amount as paying nonqualified expenses instead of qualified education expenses. Nonqualified expenses are expenses such as room and board that are not qualified education expenses such as tuition and related fees. Scholarships and fellowship grants that the student includes in income do not reduce the student's qualified education expenses available to figure your American opportunity credit. Thus, including enough scholarship or fellowship grant in the student's income to report up to $4,000 in qualified education expenses for your American opportunity credit may increase the credit by enough to increase your tax refund or reduce the amount of tax you owe even considering any increased tax liability from the additional income. However, the increase in tax liability as well as the loss of other tax credits may be greater than the additional American opportunity credit and may cause your tax refund to decrease or the amount of tax you owe to increase. Your specific circumstances will determine what amount, if any, of scholarship or fellowship grant to include in income to maximize your tax refund or minimize the amount of tax you owe."