Després de l'examen, volem saber quina nota hem tret.

Després de means after.

In Catalan, després is normally followed by de before a noun:

• després de l'examen = after the exam
• després de classe = after class

So the de is just part of the normal structure.

Catalan often shortens el to l' before a vowel sound.

So:

• el examen → l'examen

This is called elision. It works like this with many masculine and feminine singular articles:

• l'amic = the friend
• l'escola = the school
• l'examen = the exam

The comma separates the introductory time phrase from the main clause:

• Després de l'examen, = after the exam
• volem saber quina nota hem tret = we want to know what grade we got

The comma is natural here, especially in writing, because the sentence begins with a time expression. It is similar to English:

• After the exam, we want to know...

Volem is the 1st person plural form of voler (to want).

So:

• vull = I want
• vols = you want
• vol = he/she wants
• volem = we want
• voleu = you all want
• volen = they want

Since the sentence means we want, Catalan uses volem.

Quina nota means what grade or which grade.

Here:

• nota = grade, mark
• quina = what/which (used before a feminine singular noun)

So the phrase literally means:

• quina nota = what grade

Because nota is a feminine singular noun.

The forms are:

• quin = what/which + masculine singular
• quina = what/which + feminine singular
• quins = what/which + masculine plural
• quines = what/which + feminine plural

Examples:

• quin llibre? = which book?
• quina nota? = what grade?
• quines preguntes? = which questions?

It is not què because què usually stands alone as what, not directly before a noun:

• Què vols? = What do you want?
• Quina nota hem tret? = What grade have we got?

Hem tret means we have got or we got, depending on the English translation you choose.

It is a compound past tense:

• hem = we have
• tret = got / taken out / obtained

Together:

• hem tret = we have got / we got

In this sentence, it refers to the result of the exam.

Because the standard present tense of haver (to have, as an auxiliary) is:

• he
• has
• ha
• hem
• heu
• han

So hem tret is the correct standard form for we have got.

Learners sometimes expect havem because of the infinitive haver, but standard Catalan uses hem.

Yes. Tret is the past participle of treure.

• treure = to take out, to get, to obtain
• tret = taken out / got / obtained

A very common Catalan expression is:

• treure una nota = to get a grade

So:

• Hem tret una bona nota = We got a good grade

Even though treure literally has the idea of taking out, in school contexts it commonly means to get/receive a mark or grade.

That is just the idiomatic expression Catalan uses.

English says:

• get a grade

Catalan often says:

• treure una nota

Languages package ideas differently, so it is best to learn this as a fixed expression. Similar school-related expressions are often not translated word for word.

Yes, in many contexts you could hear:

• Després de l'examen, volem saber quina nota vam treure.

That would also mean After the exam, we want to know what grade we got.

The difference is about how Catalan presents the past event:

• hem tret links the past action to the present result
• vam treure presents it more as a completed past event

In real usage, the choice can also depend on region and style. The version with hem tret sounds very natural when the result still matters now, which it clearly does here.

The sentence is natural as written, but Catalan word order is somewhat flexible.

This version:

• Després de l'examen, volem saber quina nota hem tret.

puts the time phrase first for emphasis or context.

You could also say:

• Volem saber quina nota hem tret després de l'examen.

But the original is smoother and more natural because after the exam sets the scene for the whole sentence.

Saber means to know or to find out depending on context.

In:

• volem saber

it means:

• we want to know
• or more naturally in some contexts, we want to find out

This is a very common structure in Catalan:

• Vull saber... = I want to know...
• Volen saber... = They want to know...

Not always, but very often in this kind of context.

Nota can mean:

• a grade / mark
• a note
• sometimes a written note or brief message, depending on context

Here, because of l'examen, it clearly means grade or mark.

A very natural English translation would be:

• After the exam, we want to know what grade we got.

Depending on context, you could also say:

• After the exam, we want to know what mark we got.
• After the exam, we want to find out what grade we got.

So even though the Catalan uses hem tret literally as have taken out / obtained, the natural English choice is simply got.