Si la meva filla estudiés més cada dia, trauria una nota millor.

It is a hypothetical or unreal conditional sentence.

The pattern is:

si + imperfect subjunctive + conditional

So here:

Si la meva filla estudiés més cada dia, trauria una nota millor.

This matches English:

If my daughter studied more every day, she would get a better grade.

It suggests that, in reality, she does not study enough right now.

Estudiés is the imperfect subjunctive form of estudiar.

Catalan uses the imperfect subjunctive after si in this kind of hypothetical sentence. English often uses a form that looks like the simple past (if she studied), but Catalan uses a different mood:

• Si estudiés... = If she studied...
• Si tingués temps... = If I had time...
• Si fos més fàcil... = If it were easier...

So estudiés is not just a past tense here; it marks a hypothetical situation.

In standard Catalan, no.

In this type of sentence, the conditional does not go after si. The usual pattern is:

• Si + imperfect subjunctive
• conditional in the main clause

So the correct version is:

Si la meva filla estudiés més cada dia, trauria una nota millor.

Not:

Si la meva filla estudiaria...

This is a very important pattern to memorize.

Catalan normally uses the definite article with possessives in many everyday phrases, especially with family members:

• la meva filla = my daughter
• el meu pare = my father
• la nostra mare = our mother

So la meva filla is the normal standard phrasing.

For English speakers, this feels unusual because English usually says just my daughter, without the.

Because the possessive must agree with the noun it describes.

filla is:

• feminine
• singular

So the possessive must also be feminine singular:

• la meva filla = my daughter
• el meu fill = my son

Compare:

• meu = masculine singular
• meva = feminine singular
• meus = masculine plural
• meves = feminine plural

Because Catalan often drops subject pronouns when they are clear from the verb form or the context.

Here, trauria means would get / would receive, and the subject is already understood to be la meva filla.

So Catalan does not need to repeat ella:

• Si la meva filla estudiés més cada dia, trauria una nota millor.

You could add ella for emphasis or contrast, but it is not necessary.

Trauria is the conditional form of treure.

In school-related Catalan, treure una nota is a common idiomatic expression meaning:

• to get a grade
• to receive a mark
• to earn a grade

So even though treure often means something like take out or remove, in this context it means get.

Also, the future/conditional stem of treure is irregular:

• trauré = I will get
• trauria = I would get

So trauria is something you should learn as part of the verb’s pattern.

Because in Catalan, adjectives often come after the noun, and that is the most neutral word order here.

So:

una nota millor = a better grade

This is the natural, straightforward way to say it.

You may sometimes see adjective placement vary in Catalan, but in this sentence nota millor is the normal choice.

The accent shows where the stress goes and also helps distinguish this form from another one.

• estudiés = imperfect subjunctive
• estudies = present subjunctive, you study

So the accent is important.

In estudiés, the stress falls on the last syllable:

es-tu-di-ÉS

That fits the grammar of the sentence, because we need the imperfect subjunctive here.

Both are possible, but they do not mean exactly the same thing.

estudiés més cada dia means:

• studied more every day
• in other words, she should study a greater amount each day

But estudiés cada dia més usually suggests:

• studied more and more each day
• a growing amount over time

So in your sentence, més cada dia is the right choice if the idea is simply she should study more on a daily basis.