Self-testing of memory enhances the long-term retention of information more than restudying them or compared to no retrieval practice. In some circumstrances, self-testing our memory has a detrimental effect on memory (negative testing effect).
Eisenkraemer, R. E., Jaeger, A., & Stein, L. M. (2013). A systematic review of the testing effect in learning. Paidéia, 23(56), 397-406. https://doi.org/10.1590/1982-43272356201314