Introduction:
Preparing for the Zoology optional subject for the UPSC exam requires a thorough understanding of the subject matter as well as regular practice. To aid in this preparation, there are several journals and publications that provide practice questions and mock tests specifically designed for the Zoology optional subject.

Journals and Publications:

1. IAS Zoology Optional Test Series by EduRev: EduRev is a popular online learning platform that offers a comprehensive test series specifically designed for the Zoology optional subject. This test series includes a wide range of practice questions and full-length mock tests that cover all the important topics and subtopics of Zoology. The questions are curated by subject experts and are designed to simulate the actual UPSC exam pattern.

2. UPSC Zoology Optional by Chronicle Publications: Chronicle Publications is well-known for its UPSC exam preparation materials, and they also offer a dedicated publication for the Zoology optional subject. This publication includes practice questions and mock tests that are specifically tailored to the UPSC exam pattern. It covers all the major topics and provides detailed explanations for each question, helping candidates to understand the concepts better.

3. Zoology Optional Test Series by Evolution: Evolution is a renowned coaching institute that offers a comprehensive test series for the Zoology optional subject. Their test series includes topic-wise practice questions as well as full-length mock tests that cover the entire syllabus. The questions are designed to test the candidate's knowledge and understanding of the subject and provide them with an opportunity to assess their preparation level.

4. UPSC Zoology Optional by Arihant Publications: Arihant Publications is a well-established name in the field of competitive exam preparation books. They offer a dedicated book for the Zoology optional subject, which includes a wide range of practice questions, previous years' question papers, and mock tests. The book covers all the important topics and provides detailed solutions for each question, helping candidates to identify their strengths and weaknesses.

5. Online Platforms: Apart from specific journals and publications, there are various online platforms such as UPSC websites, forums, and educational websites that provide practice questions and mock tests for the Zoology optional subject. These platforms offer a wide range of resources, including topic-wise quizzes, previous years' question papers, and mock tests, which can be accessed for free or at a nominal cost.

Conclusion:
Preparing for the Zoology optional subject for the UPSC exam requires regular practice and self-assessment. Journals and publications like IAS Zoology Optional Test Series by EduRev, UPSC Zoology Optional by Chronicle Publications, Zoology Optional Test Series by Evolution, and UPSC Zoology Optional by Arihant Publications provide comprehensive practice questions and mock tests specifically designed for the Zoology optional subject. Additionally, candidates can also make use of online platforms that offer a wide range of resources for practice and self-assessment.