There are several reputable coaching institutes and platforms that provide Anthropology study material for UPSC preparation. Here are a few of them:

1. Vajiram and Ravi:
- Vajiram and Ravi is one of the most renowned coaching institutes for UPSC preparation.
- They offer comprehensive Anthropology study material that covers all the topics prescribed in the UPSC syllabus.
- The study material includes detailed notes, practice questions, previous year question papers, and mock tests.

2. Vision IAS:
- Vision IAS is another popular coaching institute that provides Anthropology study material for UPSC aspirants.
- Their study material is well-structured and covers all the important concepts and theories of Anthropology.
- It includes comprehensive notes, diagrams, case studies, and practice questions to enhance understanding and retention.

3. Drishti IAS:
- Drishti IAS is known for its quality study material and guidance for UPSC preparation.
- They provide Anthropology study material that is designed by experienced faculty members.
- The study material includes topic-wise notes, mind maps, flowcharts, and practice questions to help students grasp the subject effectively.

4. EduRev:
- EduRev is a popular online learning platform that offers study material for various competitive exams, including UPSC.
- They have a dedicated section for Anthropology study material where users can access notes, videos, practice questions, and previous year papers.
- The study material provided by EduRev is contributed by educators and experts in the field, ensuring its quality and reliability.

In conclusion, Vajiram and Ravi, Vision IAS, Drishti IAS, and EduRev are some reputable coaching institutes and platforms that provide Anthropology study material for UPSC preparation. These platforms offer comprehensive notes, practice questions, and other resources to help aspirants understand and master the subject effectively.