My 6 year old son goes to Abacus math Institute and I must say he loves it!!! 
The tutor and proprietor is a very patient lady who takes her time explaining how Abacus works to her students.
Not only do they do math, but also mental math which teaches your child discipline of the mind. My son has been excelling in his math at school.
I highly recommend this place.
They are found in Tracy and Mountain House.

Priscilla S.