High School Math & Science Questions

I’m building a fresh bank of high-school-level mock test items for Mathematics and Science and need an experienced subject matter expert to write them from scratch in English. Each question must be multiple-choice, exam-style, and come with a concise explanation that clarifies why the correct option works (and, where helpful, why the others don’t). Please supply everything in a single, clean CSV so I can import it directly into our LMS. Deliverables • Original Mathematics and Science questions written for high-school students • Four answer options per item, with one clearly marked as correct • A brief, accurate explanation/rationale for the correct choice • CSV file formatted as: Subject | Topic | Question | Option A | Option B | Option C | Option D | Correct Option | Explanation Acceptance criteria • Content aligns with typical high-school curricula and exam difficulty • All material is fully original and passes plagiarism checks • Explanations are clear, error-free, and written in English • CSV imports without formatting issues or broken characters Share a short sample (3–5 questions) so I can verify style and depth, and indicate how many items you can reliably deliver per week.