online MBA

Yes, many management institutes in India require entrance exams for admission to their PGDM or MBA programs, both for regular and online modes of study. Some of the popular entrance exams are:
Common Admission Test (CAT)
Xavier Aptitude Test (XAT)
Management Aptitude Test (MAT)
Common Management Admission Test (CMAT)
Symbiosis National Aptitude Test (SNAP)
NMAT by GMAC
The pattern and syllabus of these exams may vary, but generally, they assess the candidate's Quantitative Aptitude verbal ability, data interpretation, and logical reasoning skills. You should check the requirements of the specific institute you are interested in for more information on their admission process.

If you have completed your MBA in marketing and are regretting your decision, it's essential to identify the reasons behind it. Did you find that the coursework did not align with your interests, or was it the job opportunities after graduation that did not meet your expectations? If you find that you are not interested in marketing, you can explore other career options that align with your interests. You can also consider upskilling in areas that complement your MBA in marketing. For instance, you can take online courses in digital marketing, data analytics, or finance to diversify your skill set. If you are considering another MBA, it's crucial to assess if it will align with your career aspirations and if it is a feasible option for you. Pursuing another MBA is a significant investment in terms of time, money, and effort. Hence, it would help if you were confident that it would provide you with the desired outcomes. Before you make a decision, consider the job market and the demand for professionals with an MBA in the specialisation you are interested in. Also, consider the reputation of the institute and the quality of education they offer. Lastly, it's essential to note that an MBA is not the only route to career growth and development. There are several other options to explore, such as Certificate programs, online courses, and professional certifications. Research and explore your options to make an informed decision that aligns with your goals and interests.