Nem todos concordaram com o resultado da prova.

In this sentence, nem todos means not everyone or more literally not all.

Here, nem is not the usual nor/neither from English-style pairings. In Brazilian Portuguese, nem todos is a very common way to say that a statement does not apply to everyone.

So:

• todos concordaram = everyone agreed
• nem todos concordaram = not everyone agreed

It suggests that some did agree, but some did not.

Because todos refers to all people in a plural sense.

• todo = every / whole / each, depending on context
• todos = all / everyone

In nem todos concordaram, todos is being used like all people or everyone, so the plural form is needed.

Compare:

• Todo aluno concordou. = Every student agreed.
• Todos concordaram. = Everyone agreed.

Because the subject is todos, which is plural.

Portuguese verbs must agree with their subject:

• todos concordaram = all agreed
• todo mundo concordou = everyone agreed
  (Here todo mundo is grammatically singular.)

So even though English might use everyone as singular, this sentence uses todos, which is grammatically plural, so the verb becomes concordaram.

Because the verb concordar normally takes the preposition com when it means to agree with something or someone.

So:

• concordar com alguém = to agree with someone
• concordar com algo = to agree with something

Examples:

• Eu concordo com você. = I agree with you.
• Eles concordaram com a decisão. = They agreed with the decision.

So in your sentence:

• concordaram com o resultado da prova = agreed with the test result

Without com, the sentence would sound wrong in standard Portuguese.

Because resultado here is being treated as the result/outcome of the exam as a general thing, not as many individual scores.

So o resultado da prova can mean:

• the result of the exam
• the exam outcome
• the test result(s), depending on context

Portuguese often uses the singular in cases where English might sometimes prefer a plural idea.

If the speaker wanted to emphasize multiple individual results, they could say:

• os resultados da prova

But o resultado da prova is perfectly natural if the focus is on the overall result or the announced outcome.

Da is the contraction of de + a.

• de = of / from
• a = the (feminine singular)

So:

• de a prova becomes da prova

This is mandatory in normal Portuguese.

Other common contractions:

• de + o = do
• de + os = dos
• de + as = das

So:

• o resultado da prova = the result of the test
• literally: the result of the test/exam

Here, prova means test, exam, or quiz, depending on context.

This is a very important false friend for English speakers, because prova often does not mean proof in everyday educational contexts.

In school contexts:

• prova = test / exam
• fazer uma prova = to take a test
• resultado da prova = test result

If you want proof in the sense of evidence, Portuguese often uses:

• prova in legal/formal contexts
• evidência or prova depending on the situation

But in this sentence, it clearly means exam/test.

Concordaram is the pretérito perfeito (simple past / preterite) of concordar.

It refers to a completed action in the past:

• concordaram = they agreed
• in this sentence: not everyone agreed

This tense is used because the sentence is talking about a finished reaction to the exam result.

Compare:

• Nem todos concordaram... = Not everyone agreed...
  (specific completed event)
• Nem todos concordavam... = Not everyone used to agree / were agreeing...
  (ongoing, habitual, or background past situation)

So concordaram is the natural choice if the speaker is referring to a particular moment after the result came out.

Yes, absolutely. That is a very natural Brazilian Portuguese alternative.

Compare:

• Nem todos concordaram com o resultado da prova.
• Nem todo mundo concordou com o resultado da prova.

Both mean essentially the same thing: Not everyone agreed with the test result.

The difference is mostly style:

• nem todos sounds a bit more neutral or slightly more formal
• nem todo mundo sounds very common and conversational in Brazilian Portuguese

Notice the verb difference:

• todos → plural → concordaram
• todo mundo → singular → concordou

It is better to say Nem todos concordaram.

For an English speaker, todos não concordaram may seem like a direct translation of not everyone agreed, but in Portuguese it sounds unnatural or ambiguous.

Nem todos concordaram is the standard and idiomatic way to express:

• not all agreed
• not everyone agreed

So this is a good pattern to remember:

• Nem todos... = Not everyone...
• Nem sempre... = Not always...
• Nem tudo... = Not everything...

The original order is the most natural:

• Nem todos concordaram com o resultado da prova.

But Portuguese does allow some flexibility, especially for emphasis. For example:

• Com o resultado da prova, nem todos concordaram.

This version puts emphasis on with the test result.

Still, for most learners, the basic order is the safest:

subject-like expression + verb + prepositional phrase

So it is best to learn the sentence as:

• Nem todos
  • concordaram
    • com o resultado da prova

A natural Brazilian pronunciation would sound roughly like:

nem TO-dus con-cor-DA-ram com u re-zul-TA-du da PRO-va

A few helpful notes:

• todos often sounds like tôdus in casual speech
• com o often blends and sounds like comu
• resultado has stress on ta
• prova has stress on pro

A rough English-friendly approximation:

nem TOH-doos kohn-kor-DAH-rum koh-moo heh-zool-TAH-doo dah PROH-vah

This is only an approximation, but it can help you hear the rhythm of the sentence.