Scrum Tester helps you succeed in Professional Scrum Master™ level 1 (PSM™ I) Certification. It is designed to test your Scrum knowledge and it is a great product to use when you are mobile. The application contains more than 300 questions which revolve around Scrum guide.
The PSM certification from scrum.org is one of the best known Scrum certifications, and is a good way of proving your knowledge in the subject.
The best thing about the certification is that you do not need to attend a classroom training. The exam is only $150. You can buy the exam from Scrum.org, and take it online after you train well with Scrum Tester.