This article provides our findings on the construction of reliable and robust Kinematics exams, using the software "Scientific WorkPlace, " to be taken online. We propose the primary criterion of invulnerability for tests submitted online with a repetitive or simultaneous application. We found that a database with a minimum of 200 questions sufficiently guarantees the invulnerability of a test in a typical population of students. This pioneering work turns the concepts of Customized Continuous Assessment for massive Physics' courses at a university level into a reality. The developed tool enables, in a timely manner, the evaluator and the evaluated to identify errors and faults present in the teaching-learning process.