Taking practice tests is the best way to prepare for an exam. Successful students in grade school and college study using guides and exam preparation questions based on the test subject material. This same successful methodology can also help prepare for professional exams like ISP Certification and SPeD Certification. DSS has study material and tests available for those who enrol, NCMS has test study material as well.
Practice tests augment certification exam preparation. Red Bike Publishing's Unofficial Study Guide features four complete test length practice exams based on NISPOM. It could help you pass the ISP and SPeD certification exams.