Exam

You can prepare for all entrance tests at same time. It is a tough task but not impossible. For this a proper strategy is required. Here are some important tips. 

• Compare the syllabus: All engineering entrance exams have almost the same syllabus. There might be some additional topics in some exams. The aspirant must study the syllabus for all exams and find out the topics that are extra, and prepare those separately. Almost 90% of the topics will be common for all entrance exams, and hence, syllabus completion for one exam will lead to completion of the syllabus for all the exams.
• Prepare for JEE Mains and incorporate the preparation for all other exams: Apart from JEE Advanced, all the exams are pretty straightforward for a well-prepared candidate. JEE Advanced require a higher level of preparation as the questions are multi-conceptual. However, the state-level entrance exams, and exams like BITSAT, VITEEE, etc., have direct questions. Most of the questions in JEE Mains are also direct and require the application of basic concepts. Hence, the candidates must prepare for one exam, like JEE Mains, that will cover their preparation for all other exams.
• JEE Advanced needs extra effort: For JEE Advanced candidates must focus on time management and building exam day temperament. Learn how to apply multiple concepts to a question.

The bottom line is to prepare for JEE Mains to cover the preparation for all other CETs and exams like BITSAT and VITEEE. For JEE Advanced, work on sharpening your skills of time management, stress handling, multiple concept application, speed and accuracy.