On the fourth day of Week 10 in the study plan, you should complete the following specific tasks:

1. Prepare Chunk D: Dedicate 1 hour to preparing new study material. This could involve learning new vocabulary, grammar points, or language skills[5].
2. Review Chunk C: Spend 30 minutes reviewing the material you prepared on the third day. This review should be active, involving self-testing and evaluating your learning to ensure you understand the material well[5].
3. Review Chunk B: Dedicate 15 minutes to review the material you prepared on the second day to reinforce your learning[5].
4. Review Chunk A: Spend another 15 minutes reviewing the material from the first day to aid in long-term retention[5].

These tasks are designed to follow a structured approach to learning, breaking down the material into manageable chunks and reviewing them progressively to enhance understanding and retention.

Citations: [1] https://www.intelligent.com/create-a-study-plan/ [2] https://blog.prepscholar.com/sat-study-plan [3] https://www.linkedin.com/pulse/average-googler-four-weeks-study-plan-milad-naseri [4] https://www.vu.edu.au/about-vu/news-events/study-space/how-to-make-an-effective-study-plan [5] https://lsc.cornell.edu/how-to-study/studying-for-and-taking-exams/the-five-day-study-plan/