Problem 3: A circle with center O has a radius of 5 cm. Two chords, AB and CD, intersect at point E. If AE = 8 and EB = 4, what is the length of CD?

Every National-level problem has a "hook"—a specific realization that makes the problem solvable. Highlight that hook in your notes. Where to Find Official Problems and Solutions

Geometry: Expect problems involving 3D geometry, coordinate geometry, and advanced circle properties. Knowledge of Heron’s Formula, the Law of Sines/Cosines (though often solvable via clever dissection), and Ptolemy’s Theorem can be advantageous.

If you are looking for authentic materials, the best resources include:

The best way to prepare for the National Sprint Round is through "simulated pressure."