Your earned income credit and/or child tax credit are based on the amount of income you earned by working. The amount of the refundable child tax credit you could get based on the income you mention is "about" $120.
You can use the IRS earned income credit assistant to see what your earned income credit should be based upon the income you earned and the number of dependents you are claiming.
The IRS offers a tool to help you estimate your EIC:
https://www.irs.gov/credits-deductions/individuals/earned-income-tax-credit/use-the-eitc-assistant
https://www.irs.gov/credits-deductions/individuals/earned-income-tax-credit
And...If your only income for the year was $3300---there might be another adult who supported you and your children who should be claiming all of you as dependents.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
