Three questions.
1/ you seem to have an unusually cooperative school and access to other resources. Would the school do more or is there anything you can't access without scores?
2/ Are you the kind of person who HAS TO KNOW, do you shake and prod Christmas presents? Did you find out the sex of your baby?
3/ Do you second guess yourself and need stuff in black and white?
If the answer to any of these questions is yes AND you can test without causing more than minor economic hardship then test but if not wait until you need to.
