Claude Certified Developer Foundations: 6 Practice Exams

This certification is for the person who writes the code. The official guide says so without hedging: it is not for non-technical or casual users, nor for roles limited to prompt writing without responsibility for the application. The exam assumes you know Python or TypeScript, that you have called the API, that you have debugged a tool loop, and that you have shipped something. This course is six full practice exams, 318 original questions, built with the official Exam Guide in hand. Each mock has 53 questions, 120 minutes and the same per-domain mix as the real exam, so that by the time you sit it you already know exactly what you are walking into. WHAT EVERY QUESTION CARRIES An explanation for every option, not just the correct one. When you get a question wrong, what matters is not reading which answer was right: it is understanding what was reasonable about the one you picked and why it fails in this particular case. A RULE: one sentence, written so you can carry it into the exam room. A TRAP: the exact mechanism of the error the most tempting distractor exploits. The SOURCE for every answer, with the link to the official documentation, so you can go and verify it yourself. A TRY IT: a check of under ten minutes you can run with your own account and your own terminal, so you watch the concept work instead of only reading about it. HOW IT IS ORGANIZED The six exams are not six copies of the same exam. Each one does a different job in your preparation. Exam 1 is a diagnostic. It is slightly more accessible than the rest and it is meant to be taken before you study: the per-domain report will tell you where you are weak, so you do not spend time revising what you already know. Exams 2, 3 and 4 are full mocks with the difficulty mix of the real exam. Each one looks at the work from a different angle: exam 2 from building and shipping, exam 3 from what breaks in production, exam 4 from deciding with a budget of cost, latency or quota on the table. Exam 5 is called Traps and nuances, and it is deliberately the hardest. In every question, the option that will tempt you most is something that would be exactly right in a situation only slightly different: retry it, raise max_tokens, add a cache breakpoint, switch model, add a subagent, write a hook. It is the exam that teaches you to read the constraint precisely, which is where the points are really lost. Exam 6 is your final rehearsal. Take it last, timed, in one sitting, with no pauses. WHAT IT COVERS The coverage follows the eight official domains at their exact weights: agents and workflows (14.7%), applications and integration (33.1%), Claude Code (3.1%), eval and testing and debugging (2.6%), model selection and optimization (16.8%), prompt and context engineering (11%), security and safety (8.1%), and tools and MCPs (10.6%). Inside you will find the whole mechanics of the Messages API with its stop_reason values, the streaming contract event by event, thinking and effort levels, vision and documents, the Message Batches API and when it beats realtime, calling Claude through Bedrock and Vertex, which errors retry and which never will, the Agent SDK against a hand-written harness against a managed runtime, subagents and context isolation, the third-party frameworks the guide names, prompt caching with its breakpoints and what invalidates a prefix, context editing and compaction, token budgeting and what the usage object really reports, migrating between model versions, tool and schema design, MCP servers and their transports, Skills against tools against MCP, prompt injection and its documented mitigations, hooks as guardrails, the permission evaluation order, key and secret handling, and how to tell a failure in your code from a failure in the model. Each of the 25 objectives in the official guide appears in all six exams. HOW THE QUESTIONS ARE BUILT The scenarios are recognizable engineering teams at fictional Latin American companies: an analytics platform, a payments fintech, a marketplace, an electronic health record, messaging infrastructure for developers, a game studio. An agent that hangs one run in twenty, a token bill that tripled, a test that only fails in CI, a deploy on Thursday. You will read request bodies, usage objects, tool definitions, JSON schemas, fragments of settings.json, entries in .mcp.json, CLI commands and traces. This is a developer exam and the questions are written as such. Every question is original and written from the official documentation. You will not find questions copied from other courses here, and the two sample questions from the official guide are deliberately not reproduced. BEFORE YOU BUY This is a practice exam course: there are no video lectures. It is built to sit alongside your study of the official documentation and your own experience building with Claude, not to replace them. These are not the real exam questions. The content of the official exam is confidential. What this course does is test you against the same objectives, in the same format, at the same level of difficulty. If you have not written code against the Claude API, this is not your exam yet: look at the Associate certification, which tests professional use of Claude without programming. And if what you want is to design agent systems at enterprise scale, that is the Architect credential. HOW I RECOMMEND USING IT Take exam 1 cold, before studying, and read the per-domain report. Study what that report points at, using the links in each explanation. Take exams 2, 3 and 4 a week apart, and on each review look not only at your mistakes but at the rules behind the questions you got right by a narrow margin. Save exam 5 for when you already feel comfortable. Then take exam 6, timed, in the week before your official exam. This course was developed with the support of artificial intelligence at various stages. The design, the criteria and the final review are mine, and I stand behind every question in the bank. If you score 85% or higher on exams 5 and 6, you are ready. See you inside.