Learn to read axis labels, units, and footnotes before calculating. Many errors come from misreading thousands versus lakhs rather than weak math.
Practice percentage change, ratios, and averages until they feel automatic. Use approximation when answer choices are wide apart, but calculate precisely when options sit close together.
Gradually mix DI sets with time limits. Start with single-chart sets, then combine multiple charts exactly as examiners present them.
Unit traps
Questions often mix lakhs and crores, or percent versus percentage points—underline units before calculating.
Multi-chart sets
Identify which chart answers which question first; do not merge datasets before you need them.