AB-900: Copilot & Agent Administration Practice Tests

This course contains the use of artificial intelligence.

Prepare for Microsoft AB-900 with 320 questions focused on the decisions a new Microsoft 365 and Copilot administrator needs to make. A user can sign in yet still lack access to a file. An agent can be approved yet unavailable to its intended audience. A billing notification can appear without stopping consumption. These tests help you identify the controlling condition and choose the appropriate next action.

Version focus: This course follows the published English outline effective October 14, 2026, checked on October 13, 2026.

What is included

• Four focused tests of 60 questions each: Microsoft 365 objects and security foundations; identity troubleshooting and Copilot data boundaries; Purview governance and SharePoint access; and Copilot licensing, prompts and agent administration.
• Two mixed timed tests of 40 questions each, with a 45-minute practice limit. Each combines the three exam domains in a 13/15/12 split.
• Single-answer questions and a small number of multiple-answer questions that state how many answers to select.
• Feedback for every answer option, an overall explanation applying the rule to the scenario, and a review suggestion with official reading links.

Decisions you will practice

Distinguish users, groups, service plans, administrative roles and collaboration objects. Interpret sign-in and audit evidence, Conditional Access requirements and privileged-role activation. Select Purview capabilities for classification, data loss prevention, retention, risk review and compliance investigation. Review SharePoint exposure and separate content permissions from restricted access group membership.

For Copilot and agents, distinguish grounding from permission expansion, licensing from source access, and consumption from adoption. Work through billing-policy scope, saved and scheduled prompts, agent configuration and testing, audience access, approval and lifecycle decisions. The mixed sets include changed conditions and follow-up tasks as well as deliberate reinforcement of core rules.

How to use the tests

Start with the focused tests and read the feedback for incorrect options as well as the correct answer. Keep a short note of the control, evidence source or prerequisite you missed. Then attempt a mixed set under the time limit and revisit the relevant official material before taking the second set.

The 40-question mixed sets and 80% practice target are course choices. Microsoft does not publish a fixed AB-900 question count; the official 700 scaled passing score is not a conversion of this practice percentage. This is an independent practice course, not an official Microsoft exam or a guarantee of a passing result.