One home for NDA past papers, strategy, and concept notes

Mean, median, mode, dispersion, regression — taught concept-by-concept with worked PYQ examples.

Magnitude, dot/cross product, scalar triple, vector geometry — small but high-yield NDA Maths chapter.

Classical probability, event algebra, independence, conditional probability, Bayes — pedagogy-first ramp from defining the sample space to bounds.

Mechanical longitudinal waves, v = fλ, frequency bands, SONAR, beats, ear anatomy, echo — 34 PYQs across five subtopics, mostly EASY.