As a service to local our homeschool community, RBCS offers two time-proven standardized tests.  These tests currently fulfill the compliance requirement for county registered students as well as RBCS Umbrella Program students.  Students do not need to be in an RBCS Homeschool Assistance Program to take these tests. For students not in an RBCS umbrella program, we will keep test scores on file in the Homeschool office for 6 months after submitting them to parents.

California Achievement Test (CAT)

This test is offered in a group setting at regular intervals during the spring and summer. Individualized testing is available by appointment. The CAT is a 3-4 hour test that covers core subjects only:

  • Mathematics (computation, concepts & problems)
  • Language Arts (mechanics, usage & structure, spelling)
  • Reading (vocabulary and comprehension)

California Achievement Test (CAT) Fees & Registration Form

Stanford Achievement Test (SAT) with OLSAT

This group test is offered once annually in the spring for a $100 testing fee. It is a two morning test that covers several subject areas and includes the OLSAT (Otis-Lennon School Ability Test) aptitude test. Individualized testing is not available.  (Note:  this is not the same as the College Board SAT college entrance exam.  Please go to for that non-RBCS affiliated test information.)

The subject areas covered by the Stanford Achievement Test are:

  • Mathematics
  • Language (mechanics and expression)
  • Reading (vocabulary and comprehension)
  • Spelling
  • Science
  • Social Science
  • Thinking skills
  • OLSAT score (verbal and non-verbal)