You can check out SkillCertPro site. They provide valid exam questions for practice.
Yes it’s always recommended to practice exam questions before giving the exam. Though this is easy, preparation is always important to crack the exam.
Go through all the questions from SkillCertPro and read the explanations well. These are enough to clear the exam with ease.
I cleared my ms900 2 months back using their material.
Good luck. Let me know if you need any help or other questions with respect to exam