Yes, you can. There are certain differences between the two exams that you should know.
If you think of doing a crash course when just one month of the exam is left, you will be going to the coaching for half of your day and they will try putting in a lot of information in your head so that you have a vague general idea about the syllabus but you won’t have a good foundation on any of the topics. This acts as a major problem when giving an exam such as IPMAT as the questions are quite simple but have a tricky element to them.
Therefore, it is better to start preparing as early as possible and cover all the topics at least once. Some simple topics like algebra, time and space, etc., can be left out. You can solve a specific set of questions for these topics as exam questions do not differ a lot from them.
For other topics which are comparatively difficult, use material from various coachings and you can go through those chapters at least once.