Student assessment serves several important purposes:
1. To evaluate what students have learned and how well they can apply that knowledge. 
2. To provide feedback to students on their progress and help guide their learning.  
3. To help teachers improve their teaching methods and curriculum.
Effective student assessment follows key principles such as using valid and reliable measurement tools, employing a variety of assessment techniques, and ensuring students understand the assessment criteria. The primary goal of assessment should be to enhance student learning.