Is AB-620 hard? Real difficulty and a plan by profile

It is not a memory exam: there are almost no "what is X" questions. It is an exam of judgment about a fast-changing product. Questions describe a need (approval before an action, an external agent with multiple turns, an MCP resource that does not show up, text that must validate exactly) and the four options are real components. You fail when you know the names but have not lived the difference between them.

What is not hard: the testing and ALM block (20–25%) has direct questions if you have created a solution and moved an agent across environments; and the planning block (30–35%) rests on principles you already know if you have worked with Power Platform: identity, least privilege, governance, channels. The curve is in the 40–45% of integration.

You have the most valuable thing, hands-on experience with knowledge, instructions, topics and tools. What you usually lack is advanced integration: MCP, A2A, Foundry and Fabric agents, REST APIs with authentication, Application Insights and pipelines. Four to six weeks: one to review planning and identity with the outline in front of you, three for integration with your own lab (an MCP server, a custom connector, a connected Foundry agent), one or two for evaluation, ALM and mock exams.

Typical risk: underestimating the exam because you know the product well and not practicing the format. Take a diagnostic mock exam in the first week; if you are below 60%, the problem is not knowledge but reading scenarios.

You bring Dataverse, custom connectors, Power Fx, solutions, environments, environment variables and adaptive cards, the base of half the outline. What you lack is Copilot Studio itself: generative orchestration, topics, agent flows, knowledge sources, agent evaluation and the agent protocols. Five to seven weeks: two building a complete agent with enterprise knowledge and tools, two of advanced integration, one of testing and ALM applied to agents, one of mock exams.

Advantage: API and authentication integration questions will feel familiar. Be careful answering "like in PL-400": in AB-620 the orchestration decides which tool to use from its description, and several questions revolve around that.

You know the business, governance and the tenant, but you have not integrated APIs or worked with agent protocols. Eight to ten weeks, with a mandatory lab: the first half to build agents in Copilot Studio and understand connectors, basic Power Fx and Dataverse; the second for integration, evaluation and ALM. If possible, pair up with someone technical who shows you a working custom connector and MCP server.

Profile 4: someone new to Power Platform and to agents. It is possible, but count twelve weeks or more and consider AB-900 (Copilot and agent administration, fundamentals) or AB-730 (using Copilot) as a step first: the AB-620 outline assumes experience you will have to build by practicing. In every case, the six-week plan works as a skeleton and the outline explained as a checklist; when you want to measure yourself, practice AB-620 by domain.