Yes, you can. There is no limit to the number of times you can take the TOEFL test, but you cannot take it more than once in a 12-day period.

If you already have a test appointment, you cannot register for another test date that is within 12 days of your existing appointment.

This policy will be enforced even if a violation is not immediately identified

If the violation is identified after registration, but before the test date, your test appointment will be canceled and your test fee will not be refunded.

If the violation is not identified until after your scores have been reported, your scores will be cancelled.

You and any score recipients will be notified by a cancellation letter. Your test fee will not be refunded.

Test Sections-

Reading section-

The Reading section includes 3 or 4 reading passages. There are 12 to 14 questions per passage. You have from 60 to 80 minutes to answer all the questions in the section.

TOEFL iBT Reading passages are excerpts from university-level textbooks that would be used in introductions to a discipline or topic. The passages cover a variety of different subjects. Don't worry if you're not familiar with the topic of a passage. All the information you need to answer the questions will be included in the passage.

Listening section -

The Listening section includes questions about academic lectures and longer conversations in which the speech sounds very natural. You can take notes on any audio material throughout the entire test. The Listening section is composed of:

4 to 6 lectures, each 3 to 5 minutes long, 6 questions per lecture, 60 to 90 minutes
2 to 3 conversations, each 3 minutes long, 5 questions per conversation, 60 to 90 minutes

Speaking section-

The Speaking section is approximately 20 minutes long and includes 6 questions.

The first 2 questions are called "independent Speaking tasks" because they require you to draw entirely on your own ideas, opinions and experiences when you respond.
The other 4 questions are called "integrated Speaking tasks" because they require you to integrate your English-language skills — listening and speaking or listening, reading and speaking — just as you would in or out of a classroom.

You will speak into the microphone on your headset and your responses will be recorded and sent to ETS, where they will be scored by certified human raters.

Speaking responses -

Your recorded responses are sent to ETS, where 3 to 6 certified human raters score them holistically on a scale of 0 to 4. The average score on the 6 tasks is converted to a scaled score of 0 to 30.
Raters do not expect your responses to be perfect, and even high-scoring responses may contain occasional errors. Your pronunciation does not need to sound like that of a native English speaker. The raters are listening for the effectiveness of your communication and your ability to accomplish the tasks you are given.
See the Speaking scoring guides (PDF) and listen to sample responses to help you understand how responses are evaluated.

Writing section -

The total time for the Writing section is 50 minutes. You are asked to write responses to 2 writing tasks: an integrated Writing task and an independent Writing task.

Integrated Writing task (20 minutes) — read a short passage and listen to a short lecture. Then write in response to what you read and listened to.
Independent Task (30 minutes) — write an essay in response to a Writing topic.