Welcome to the forum! Yes, they absolutely can if you use the right methodology. Traditional static tests are easy to cheat on. However, adaptive testing changes the game entirely. I recommend looking at how Examinizer handles this issue. They built an online platform for language and professional skills testing that uses smart algorithms. The system pulls random questions from a huge expert database. No two students ever see the same sequence of questions. Looking up answers online becomes completely useless. It keeps the results totally honest.