Tips for the TOEFL

Before test day
The directions at the beginning of each section will tell you the total number of questions in the section and time allowed for the section. Read the directions carefully. They explain exactly what is required to answer each question type and can be reviewed as needed.
Before test day become very familiar with the different sections and their instructions.
To prepare for the Writing section of the test, practice by using the Writing topics found in the TOEFL Information Bulletin. You will have 30 minutes to compose your assigned essay. You may either hand write your essay or type it on the computer.
Taking a test on computer is very different from taking one on paper, and you need to be prepared. Even people who work with computers every day could have difficulties taking a test on computer. Practice, practice & practice.

Test
Pace yourself so that you have enough time to answer every question. Pay attention to the number of questions and the amount of time remaining during your testing session. Do not spend too much time on a single question.
Read each question carefully and thoroughly. Before answering a question, determine exactly what is being asked. Always read and understand all possible answers. If you do not, you may miss important information.
Because your score is based on the number of questions you answer correctly, it is to your advantage to answer every question, even if you have to guess.

Tips for the CAT (This applies to the Listening Comprehension and Structure sections)
If you are not sure of the correct answer to a question, make the best guess you can and go on to the next question. You can't go back to earlier questions
Start Off Strong: The CAT puts much more value on the earlier questions than the later questions. The computer has to make large jumps in the estimation of your score for each of the first few questions. The later questions are used to fine-tune your score. To get the best possible score, focus more time on the earlier questions than the later questions.
Know when to call it quits. You cannot go back to earlier questions on the TOEFL computer adaptive sections, so you have to pick and answer, make a good guess and move on to the next question.