How can I improve quantitative aptitude and data interpretation for UPSC CSAT?

To improve CSAT Quant and DI, focus on conceptual clarity over rote memorisation.
Start with NCERT maths (Classes 6–10) to solidify basics like Percentages, Ratios, and Averages.
Use R.S. Aggarwal or Sleepy Classes' modules for shortcut techniques.
Prioritise Previous Year Questions (PYQs) to understand the logic behind Number Systems and data-heavy tables, ensuring you focus on accuracy to hit the qualifying 33% mark.