Hey!
It is totally fine to prepare for three different exams at a same time if they have same syllabus. Its just you need to become familiar with the question paper patten of these three exams as they might be diffierent and cause problems to you later. To solve this issue, keep practicing previous years question papers, these will not only help you to understand the question paper as well as help in time management. Free online test series are: Grade up, made easy,toppersexam, onlineengineersacademy etc.
Thankyou!
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