Certified Math Tutor for 12-Year-Old

Hi, I'm looking for a certified math tutor to help my 12-year-old son with: - Calculating area, perimeter, and volume - Adding, subtracting, multiplying, and dividing fractions and decimals - Understanding ratios and percentages Tutoring sessions will use video chat, like Zoom, Meet, etc... (Budget: $20 - $40 USD, Jobs: Education & Tutoring, Math Tutoring, Mathematics, Matlab and Mathematica, Teaching/Lecturing, Tutoring)