Here's the list of things to learn and be thorough with before attempting calculus:-

• Sets
• Real numbers
• Complex numbers
• Solving inequalities and equations
• Properties of functions
• Composite functions
• Polynomial functions
• Rational functions
• Trigonometry
• Trigonometric functions and their inverses
• Trigonometric identities
• Conic sections
• Exponential functions
• Logarithmic...