First, review the basic ideas of angles, such as what an angle is, how it is measured (in degrees, minutes, and seconds), the various types of angles (straight, acute, and obtuse), and the common measurement systems (radian and sexagesimal). This will help you pass the Class 11 Math test on angles and their measurement.  Next, practice using the formula degrees = radians × (180/π) to convert between radians and degrees.  Use the formulas s = rθ and A = (1/2)r²θ to solve problems involving the arc length and area of a sector, respectively.  Lastly, to put these ideas into practice and boost your confidence for the real test, go over sample test papers and practice questions from your textbook or online resources.