There are two sections on the AP Calculus AB Exam. Section 1 is the multiple choice section while section 2 is the free response section. Each section also has 2 parts to them. One involves a calculator while the other doesn't.

Section 1: Multiple Choice Question

Part A: 30 MCQ in 60 minutes (Calculator not allowed)

Part B: 15 MCQ in 45 minutes (Calculator allowed)



Section 2: Free Response Section

Part A: 2 FRQ in 30 minutes (Calculator allowed)

Part B: 4 FRQ in 60 minutes (Calculator not allowed)

People tend to like the free response section more due to partial credit. On a multiple choice question, if you get it wrong there's no chance of receiving partial points unlike the free response section. Many people believe that extra preparation is required for the multiple choice section. However, if you are fluent with all the topics and know how to apply them, then the multiple choice questions are simply very short free response questions with answer choice.
Some resources can help you prepare faster than others since they come straight to the point are designed to maximize your chance of getting a 5 on the AP exam. The book on the right was made by Ritvik Rustagi, founder of TMAS Academy.
It contains over 190 pages and hundreds of problems to help you prepare for the AP exam. All problems also have detailed solutions, and are organized by the unit.
The videos on the TMAS Academy youtube channel can be helpful to review. They are short and come straight to the point to make preparing for these exams easier.
Guide to Preparing for the AP Exam
AP Calculus AB is a long 8 unit course. There are two types of people that take the course, and the methods used to study should be different for each group. One group consists of students taking the course in school while the other includes students that self study the course.
For students taking this course in a proper classroom setting, make sure to listen to the teacher and follow along the course as your teacher covers the material. Taking this course in a classroom setting already puts you above students that are self studying. Some popular books used in a classroom setting include the following books below.
For students selfstudying, choose a textbook from the slideshow above. It's different from the review textbooks in terms of gaining depth for the content. Some students are able to prepare for the exam solely through the review textbooks, but others need to use indepth textbooks to gain a rich understanding of the topic. After you have chosen a book, make sure to pace yourself so you can finish the course on time. Try to allocate time properly for each of the 8 units so you have enough time to not only learn the theory but practice. At the end of the day, successful mathletes spend between 5 to 10% of their time learning the theory, and the rest practicing.
Course Overview
Unit #  Topics  Weightage on Exam 

Unit 1: Limits And Continuity
Unit 2:
Differentiation: Definition and Fundamental Properties
Unit 3:
Differentiation: Composite, Implicit, and Inverse Functions
Unit 4: Contextual Applications of Differentiation
Unit 5: Analytical Applications of Differentiation
Unit 6: Integration and Accumulation of Change
Unit 7: Differential Equations
Unit 8: Applications of Integration

What is a limit?

Approximating limits with tables, graphs, or functions

Does a limit exist at a point?

Properties of Limits

Squeeze Theorem

Types of Discontinuity

Limits at Infinity

Intermediate Value Theorem

Average rate of change

Instantaneous rate of change

What is a derivative?

Limit definition of a derivative

Continuity and differentiability relationship

Power Rule

Derivative rules: addition and subtraction

More derivative rules

Derivative of Trigonometric Functions

Product and Quotient Rule

Chain Rule

Implicit differentiation

Differentiating inverse functions

Differentiating inverse trigonometric functions

Differentiating higher order derivatives

Interpreting derivatives

Relating calculus to motion

Related rates

Approximating a value for a function using local linearity

L’Hopital’s Rule

Mean Value Theorem

Intermediate Value Theorem

Extreme Value Theorem

Critical points

Relative extrema

Determining if a function is increasing/decreasing

The First Derivative Test

Candidates Test

Determining concavity

The Second Derivative Test

Optimization

Behaviors of implicit relations

Riemann Sums

Definite Integral

Fundamental Theorem of Calculus

Accumulation functions

Properties of definite integrals

Antiderivatives

Indefinite Integral

USubstitution

Integration with long division

Integration with completing the square

Slope fields

Draw solution curve on a slope field

Solving differential equations (general and particular solutions)

Separation of variables

Modeling growth patterns

exponential growth/decay


Average value of a function

Interpreting definite integrals

Area between curves

Volume of solid with known cross section: squares, rectangles, triangles, semicircles

Volume of solids of revolutions

disks and washers

1012% Exam Weightage
You are very unlikely to see a problem from this unit on the free response section. However, expect around 58 multiple choice questions on this topic. They will be relatively straight forward compared to other questions. You will need to be fluent with continuity and evaluating limits by considering factors such as discontinuity.
1012% Exam Weightage
Despite the low weightage of this unit, it's fundamentals that must be known to differentiate for harder problems from other units. There won't be many problems that solely use topics from this unit on the free response question. However, there will always be some parts of a free response question that involve topics from this unit. This unit is a key pillar to be able to differentiate throughout the entire course.
913% Exam Weightage
Expect to see topics from this unit on some parts of free response questions. There is always one application of the chain rule on the free response section, and some regarding that topic on the multiple choice section. The rest of the topics are likely to appear on the multiple choice section.
Pay close attention to the chain rule and differentiating inverse trigonometric functions. That doesn't mean you should neglect the other topics since they will also appear on the exam.
1015% Exam Weightage
Pay close attention to related rates. The word problems regarding related rates cause many people to mess up on the exam. Resources for related rates can be found in the TMAS Academy AP Calculus AB book.
There will almost always be one multiple choice question and one part from a free response question that uses L'Hopital's Rule. In addition to that, it's common to see a problem that involves a factor like motion and causes you to differentiate and interpret in the context of the problem. Expect a handful of motion problems on the multiple choice section.
1518% Exam Weightage
This unit will guaranteed show up on the free response section. THere will be one problem dedicated to it. Popular topics include finding the relative extrema using the first and second derivative tests. Sometimes the mean value theorem and intermediate value theorem can show up on the free response section (more prominent on MCQ).
On the multiple choice section, expect to see 12 problems regarding the mean and intermediate value theorem. There will always be multiple questions that involve critical points and finding relative extrema.
You will definitely encounter multiple problems that will ask you to find absolute extrema on both the multiple choice and free response sections.
1720% Exam Weightage
This topic has a very high yield on both the free response and multiple choice sections. You will very likely see an entire free response question that incorporates topics from this unit. There were will also be many multiple choice questions from this section. Make sure to check out the TMAS Academy AP Calculus AB book as it contains tons of problems for every unit including this one.
612% Exam Weightage
Most people tend to like this unit in comparison to others as there are less topics. There's a high chance of receiving an entire free response question that involves differential equations. Most of the times, the parts will consist of sketching a slope field and using separation of variables to solve the differential equation.
Expect to see around 5 questions on the multiple choice section that involve this unit.
69% Exam Weightage
This unit is on the harder site when it comes to visualization. There's a good chance of seeing a free response question for this unit. There will be at least 5 multiple choice questions on top of that for this unit.
Make sure to watch the AP Calculus AB/BC Unit 8 Rapid Review video to see visualizations for these solids of revolutions and solids with known cross sections. It will help you a lot on the AP exam.