There are several journals and publications that provide tips for effective time management during the UPSC Mathematics Optional subject exam. These resources can be highly beneficial for candidates aiming to optimize their study schedule and ensure efficient use of time. Here are some recommended publications:

1. "Mathematics Today" by the Indian Mathematical Society:
- This monthly journal covers a wide range of mathematical topics and includes articles, problem-solving techniques, and tips for efficient time management.
- It offers insights into various strategies that can help candidates effectively manage their time during the UPSC Mathematics Optional subject exam.

2. "The Mathematics Educator" by the Association of Mathematics Teachers of India (AMTI):
- This quarterly publication focuses on mathematics education and provides valuable information on effective teaching methodologies, exam preparation techniques, and time management strategies.
- It includes articles and case studies that can be helpful for candidates appearing for the UPSC Mathematics Optional subject exam.

3. "Mathematical Gazette" by the Mathematical Association (UK):
- Although not specific to the UPSC exam, this renowned journal contains articles, problem-solving tips, and exam strategies applicable to various mathematical subjects.
- It emphasizes time management techniques and offers insights into how to approach exams with limited time constraints.

4. "The Mathematics Teacher" by the National Council of Teachers of Mathematics (NCTM):
- This journal primarily focuses on mathematics teaching, but it also provides valuable resources for students appearing for exams.
- It includes articles on effective study habits, time management, and problem-solving skills that can be beneficial for UPSC Mathematics Optional subject exam aspirants.

5. "Journal of Mathematics Education" by the Mathematics Education Research Group of Australasia (MERGA):
- This journal aims to promote research and improve mathematics education.
- It publishes articles related to curriculum development, assessment strategies, and time management techniques that can be useful for candidates preparing for the UPSC Mathematics Optional subject exam.

These publications can be accessed online or through various educational platforms like EduRev, which provides a comprehensive collection of study materials, journals, and resources for UPSC exam preparations.