Hello Puneet

Yes you can easily crack IPMAT with 3 months of preparation.As you have mentioned that you belong to non maths background,it will affect your performance a little bit,I am giving you some tips through which you can crack IPMAT 2020-

• Time Management- It is most important factor in every exam,without proper time management you cannot crack IPMAT,so you should have to focus on time that at how much time you are completing one set of paper or mock.
• Join Coaching Classes- You should have to join any good coaching classes for the exam,they will start crash course classes for 1 month where you can get good guidance also they provide many things that will help you in clearing exam.Also they will prepare for the interview.
• Practice Mathematics- You are not from Maths background,that can be a negative point in your exam.But you can resolve this problem easily,you just need to go through important topics that will come in exam,you can check previous year paper for what type of question will come in exam and try to solve as much questions as you can in these 3 months.
• Solve As Much Mocks As You Can-Practice is everything,without it nothing is possible,you have to solve as much mocks as you can,coaching classes will take Mock Test when you join it.
• Read English Novels and Vocabulary everyday- English is very necessary that will help you in cracking IPMAT,you have to read novels or english newspaper everyday and also try to learn as much vocabulary as you can in a day.

So start your preparation from now or it will be late.

I Hope This Helps

Best Of Luck!!