The word graded has multiple meanings, depending on its context.
1) In education, graded refers to a system where students are given grades or scores based on their performance in an examination or assessment. For example, if a student gets 80% marks in a test, it would be said that the paper was graded.
2) Graded can also refer to something being arranged in stages of difficulty or complexity. This is commonly used when referring to music where different pieces are classified according to their level of difficulty using a system called "graded music examinations".
3) In another context, graded refers to materials that have been sorted into categories based on quality or value. For example, in the world of gemstones, they may be graded by factors such as clarity and color.