These books are what i would consider the best books for self-study. (I have gone through many textbooks after i went back to school to study statistics.)
• Real Analysis: A Long-Form Mathematics Textbook
• Proofs: A Long-Form Mathematics Textbook
• Mathematical Logic Through Python
• A Course in Calculus and Real Analysis
• A Course in Multivariable Calculus and Analysis
• Differential Equations With Applications and Historical Notes
• Probability and Random Processes (Grimmet)
• Probability Through Problems
• Fifty Challenging Problems in Probability with Solutions
• The Simple and Infinite Joy of Mathematical Statistics
• An Introduction to Error Analysis
• Real Analysis: A Long-Form Mathematics Textbook
• Proofs: A Long-Form Mathematics Textbook
• Mathematical Logic Through Python
• A Course in Calculus and Real Analysis
• A Course in Multivariable Calculus and Analysis
• Differential Equations With Applications and Historical Notes
• Probability and Random Processes (Grimmet)
• Probability Through Problems
• Fifty Challenging Problems in Probability with Solutions
• The Simple and Infinite Joy of Mathematical Statistics
• An Introduction to Error Analysis