If your child is performing below or near standard, it is not simply that they need to do more work in order to improve. Of course, effort is required in any task. However, in standard-based grading, we are assessing skills, not effort. Your child may have completed all of the work assigned to them and may still be below standard/near standard - especially if he/she has skill gaps that need to be addressed.
If you would like to know about your child’s effort, the mindset progress report that you receive every three weeks will provide you with that information. The Academic Effort and Active Learning categories of that report will let you know if your child is completing and handing in their work. However, it is possible to finish all of your work and to be performing below standard.