A free original English–Hindi cumulative review for the four Matter, Atoms and Chemical Change lessons. The 24 interleaved questions ask learners to choose the relevant distinction before calculating; every item includes a full solution and explanations of the alternatives. Needed masses, ionic charges and unfamiliar reactivity or solubility facts are supplied. Interpreting average atomic mass is included; concentration percentages, weighted-average arithmetic and the optional electron-accounting bridge are excluded. Learning settings are untimed, +1 for correct and 0 for incorrect or unattempted answers, with no negative marking or pass cutoff. These are 24 questions in two languages, not 48 different items. The review samples this module’s selected skills; it is not a full RRB CBT, official past paper or prediction of chemistry weightage.