I won't go too long on this one, but it is inaccurate to say that students who use English as their First Language would be under-rated in MUET, thus getting a Band 5 or so.

The trick is simple, use simple English. Let's make a simple comparison with Tolkien's "Lord of The Rings" and Rowling's "Harry Potter" Series. How many people would spend the time to really read Tolkien's work Word by Word? How many who do it for Rowling? This does not mean that those who read Harry Potter has a poor command of the language! People who read and understand what the author is saying has a certain level of English that enables him or her to survive in an English Speaking community!

You speak well. Good. You write well. Good. But are you sure the other person who is reading your work or listening to you understands what you are saying? The main purpose of a language is communication, and if what you say appears to be garbled messages to the other party, a language has failed its purpose. MUET is there to test whether English is used as a language efficiently, not a benchmark of your vocabulary.

At this juncture, if I have offended anybody, please don't be as it was not intended.

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Dear TS, to answer your original question, it would be advisable to get a Band 4. That would mean you have a standard of English which is more or less acceptable for normal use.

I agree though that MUET has its shortcomings and can be a better gauge of a person's mastery of the language, but there is no need for it to be replaced. After all, if you get a Band 5 or 6, you have shown a good command of the language, and it IS recognised in other countries, even though IELTS and co. would be way more prestigious, no doubt.

~Cheers!