As has already been discussed, the CAT(Computer Adaptive Test) is quite different from the normal paper and pencil test which was in vogue earlier. Some advantages and disadvantages of both the formats of the test are as follows :

I] PAPER AND PENCIL BASED TEST :
 ADVANTAGES -   
1) Skipping questions posssible,                   
2) Rechecking answers possible,                   
3) Relatively easier questions,   
DISADVANTAGES -
1) Rigid schedule of test dates,                  
2) Less time available for answering,                   
3) Delay in knowing the scores.

II] COMPUTER ADAPTIVE TEST (CAT) :
ADVANTAGES -
1) Tests held throughout the year (easy scheduling),                   
2) Retaking test possible every calender month,                   
3) More time available for answering,                   
4) Unofficial score available immediately.   
DISADVANTAGES -
1) Skipping questions not possible,                   
2) Rechecking of answers not possible,                   
3) Relatively tougher questions.

Computer adaptive tests are scored differently than the paper and pencil tests.
Your score on the CAT depends on a combination of such factors as :
1) the NUMBER of questions you answered within the alloted time,
2) your PERFORMANCE on questions answered throughout the test,
3) the level of DIFFICULTY of those questions in relation to your overall performance at that point in the test.

Now, it is firmly believed that the first 5-10 questions that one answers count the most. What this means is that if you answer the first 5-10 questions correctly, your test score goes up considerably and then even if you answer a few questions incorrectly towards the end, your score doesn't get affected much. On the other hand, if you answer some of these "strategic"( first 5-10 questions) incorrectly, your score takes a dip from the beginning and even if you answer all the remaining questions correctly, your score is not likely to recover to a higher range. This is what is firmly believed by the majority. Based on this theory it is proposed that one should answer the first 5-10 questions with the utmost caution and devoting some extra time (if required) - because getting these answers correct is very important for achieving a good score.