A free original bilingual learning review for the four Ratios Percentages and Commercial Comparisons lessons. Twenty independent questions, five per lesson, check named bases, fixed relationships, units and commercial comparisons. Includes an explained answer key and guidance on which lesson to revisit. The review is untimed, with +1 for a correct answer, 0 for an incorrect or unattempted answer, no negative marking and no pass cutoff. Its topic distribution is a teaching choice, not predicted exam weighting. It is not a full RRB CBT simulation or a complete Mathematics syllabus.