If you contact your previous instructor(s) they should be able to replace a previous class completion certificate. OTOH if you think you may be a tad rusty on the information covered in class you may want to re-take the class.
If you are just out of date on the statutes, then go to the OSBI website to get a real or virtual copy of the current legal book. Get it and then STUDY it.
If you are just out of date on the statutes, then go to the OSBI website to get a real or virtual copy of the current legal book. Get it and then STUDY it.