Unit I0 of 5 read
Write every step: CBSE gives marks for method. Learn the formulas and theorems exactly, draw the figure for every geometry and heights question, and check your answer by putting it back into the question.
Suggested order: Unit I, then II, then III, then IV, then V, then VI, then VII, then VIII, then IX, then X, then XI, then XII, then XIII, and XIV last.