Are there any test-prep publishers that focus on practice questions and quick review before school exams?

Yes. A few publishers are well known for practice-question-heavy, fast review materials that work well for school exams:

• Kaplan – lots of question banks and short review guides
• Barron’s – practice tests plus concise content review
• Princeton Review – test-prep books with drills and strategy
• School Specialty / Saddleback / Spectrum – more school-oriented practice workbooks
• Workman Publishing – compact review books like Brain Quest and similar
• Houghton Mifflin Harcourt and McGraw Hill – curriculum-aligned review/workbooks in some subjects

If you mean for unit tests, midterms, or finals rather than standardized tests, the best fit is often:

• workbook-style publishers
• teacher-resource publishers
• subject-specific review books with lots of exercises and answer keys

If you want, I can also give you:

1. the best publishers by subject (math, science, English, history), or
2. the best ones for middle school vs. high school.