Countdown to College: 21 Essential To-Do Lists for High School Students | Academic Planning & College Prep Guide" 优化后的标题符合Google SEO规范，将中文翻译成英文，并增加了使用场景（Academic Planning & College Prep Guide）。

An easy timeline to help high school students maximize each of their 9th, 10th, 11th, and 12th grade years and optimize their chances of getting into the college of their choice. These 'to do' lists provide both students and parents with the 'nitty gritty' details necessary to prepare for the college admissions process. There will be no missed deadlines or missed opportunities as this step-by-step guide show students and parents WHAT TO DO and WHEN TO DO IT! No family with college bound high schoolers should be without this comprehensive, easy to follow, resource.