I’m preparing for the GRE, but my academic marks are not so good. This might be a problem that can arise at the time of admission. Also, tell me about the GRE subject test. Is it beneficial or not?
It sounds like you are asking if a GRE or GRE Subject Test score can make up for bad grades. The short answer is it depends. Keep in mind that most (but not all) graduate programs have a minimum Grade Point Average requirement; without meeting your University of Choice’s minimum GPA requirement, it is unlikely that high test scores will help. If, on the other hand, a student does meet the minimum grade requirements of their preferred graduate school or program, then your GRE scores can possibly make a very significant difference. Coursework is the most important factor admission officers will consider when deciding whether to admit a candidate or not, since that is the context in which graduate professors will interact with students. Note that different schools calculate minimum GPA in different ways; some schools may only consider the last 60 hours of coursework on your transcript, other schools may only consider your Major GPA. If in doubt, call the school; whatever your GPA is, a high GRE score can’t hurt.
As for subject tests, having a good score on a GRE Subject Test can have a significant impact on any graduate school application. Many universities or programs will require you to submit a specific GRE Subject Test score to be even considered for admission; this is especially true at the Ph. D. level. Other universities may not require you to submit a specific GRE Subject Test, but will instead ask you to submit a Subject Test of your choice. In both of these circumstances the benefits of taking a GRE Subject Test are obvious- you won’t be admitted, or even considered for admission, without one.
Even if your university of choice does not require you to submit a GRE Subject Test score to be considered for admission, taking a GRE Subject Test can be very beneficial for any graduate school application. A good subject test score demonstrates that you are qualified and competent in the field you are applying for; it also shows that you are willing to put in extra work to succeed (something that any admission officer would like to see). A good score on a GRE Subject Test will help you stand out among other competitive candidates.
All in all, a GRE Subject Test might not be necessary, but it is certainly a good idea!
Hope this helps!