I asked a friend of mine to weigh in on your question since she used Apologia General Science with her daughter last year. In a nutshell, these were her responses:
Regarding experiments, she did most but not all of them. In certain units, there are multiple experiments that prove the same scientific law, so completing only 1 or 2 of those experiments would be sufficient.
She did not have the test booklet, so they used the Study Guide as the test. She also allowed her daughter to take open-book tests because she’s not a very good tester and there is a lot of information to absorb.
My friend was at a meeting recently where several of the moms agreed that Apologia Science courses are really AP courses (Advanced Placement), so they are excellent for college prep. Therefore, they all felt there could be a lot of leeway in testing and grading. If your child is college bound, reflecting a good grade is more important. Furthermore, if your child seems headed toward college studies in the sciences, allowing for re-reading and re-testing would further ensure that the material is properly absorbed.
HTH,
Sue