CCXD is a free Android application designed for individuals preparing for professional construction certification exams. This educational tool is built on the latest regulations effective from 2025, ensuring that users have access to updated exam structures and a comprehensive question bank in accordance with the latest guidelines. The app offers features such as tailored question review based on specific fields and exam categories, providing a focused study experience.

Key features include the ability to practice with a random set of trial questions, free for the first three attempts, after which users can opt for a VIP subscription for unlimited access. Additional functionalities include keyword search for questions and answers, as well as resources for finding reputable training centers and detailed guidance on application processes. This makes CCXD an efficient and reliable tool for those looking to succeed in their construction certification exams.