SCH refers to taxable scholarship. In a nutshell, it is the amount of scholarship and grants that exceed your qualifying education expenses, or the amount of scholarships and grants that you have elected to make taxable to claim a credit such as the American Opportunity credit.
To calculate:
What if I calculated taxable scholarship into total wages. But forgot to write SCH and scholarship amount on dotted line?
@mellieball Here's how to enter Taxable Scholarship Income:
Click this link for more info on Taxable Scholarships.