A free original bilingual mixed review after the four Series Codes and Operations lessons. Twenty questions revisit five letter-series, six number-series, five coding and four operator tasks in mixed order. These counts describe the learning review and do not predict exam weightage. Preserve each stated rule family, cycle permission, mapping condition, input order and bracket; original English code-bearing clues remain the same in Hindi. Full solutions explain the correct answer and every distractor, including why insufficient information permits different consistent answers. The review is untimed: +1 for correct and 0 for incorrect or unattempted, with no negative marking or pass cutoff. This is selected module practice, not an official past paper, full CBT simulation or proof of complete exam readiness.