Here is a curated list of legitimate, high-quality sources where you can download free and paid graded B1 tests in PDF format.
Graded PDF tests are perfect for self-assessment, but combine them with listening/speaking practice for full B1 fluency. If you need a specific topic (e.g., conditionals or business English B1), reply, and I can point you to a tailored PDF. graded multiple-choice english tests-b1 pdf