Η σχολική επίδοση επηρεάζει τον βαθμό τριμήνου.

A simple breakdown is:

• Η = the (feminine singular nominative article)
• σχολική = school / academic (adjective, feminine singular nominative)
• επίδοση = performance (noun, feminine singular nominative)
• επηρεάζει = affects / influences (verb, 3rd person singular present)
• τον = the (masculine singular accusative article)
• βαθμό = grade / mark (noun, masculine singular accusative)
• τριμήνου = of the trimester / term (genitive singular)

So the structure is:

• subject: Η σχολική επίδοση
• verb: επηρεάζει
• object: τον βαθμό τριμήνου

Because σχολική is an adjective that must agree with επίδοση.

The noun επίδοση is:

• feminine
• singular
• nominative (because it is the subject)

So the adjective also has to be:

• feminine
• singular
• nominative

That gives σχολική.

Compare:

• ο σχολικός βαθμός = the school grade
• η σχολική επίδοση = the school/academic performance
• το σχολικό βιβλίο = the school book

In Greek, the subject is usually in the nominative case. Here:

• Η is a nominative feminine singular article
• σχολική επίδοση is also nominative feminine singular

That tells you this phrase is the subject: the academic performance.

Also, the verb επηρεάζει is in the 3rd person singular, which matches the singular subject η επίδοση.

επηρεάζει is the present tense, 3rd person singular form of επηρεάζω = to affect / influence.

It is singular because the subject η σχολική επίδοση is singular.

A few forms of the verb are:

• εγώ επηρεάζω = I affect
• εσύ επηρεάζεις = you affect
• αυτός/αυτή/αυτό επηρεάζει = he/she/it affects

So:

• Η σχολική επίδοση επηρεάζει... = School performance affects...

Because βαθμό is the direct object of the verb επηρεάζει.

The verb επηρεάζω takes a direct object:

• επηρεάζω κάτι = I affect something
• επηρεάζω κάποιον = I affect someone

In Greek, a masculine singular direct object usually appears in the accusative:

• nominative: ο βαθμός
• accusative: τον βαθμό

So:

• ο βαθμός = the grade (as subject)
• τον βαθμό = the grade (as object)

In this sentence, βαθμός means grade, mark, or score.

Depending on context, βαθμός can also mean:

• rank
• degree
• level

But in a school context, τον βαθμό most naturally means the grade/mark.

So τον βαθμό τριμήνου means something like:

• the trimester grade
• the term grade
• the report-period grade

Because it shows a relationship like of the trimester/term.

The base noun is:

• το τρίμηνο = the trimester / three-month term

Its genitive singular is:

• του τριμήνου = of the trimester

In the sentence, βαθμό τριμήνου means:

• grade of the trimester
• more naturally in English: trimester grade or term grade

This genitive is very common in Greek for noun-noun relationships:

• το βιβλίο του μαθητή = the student’s book / the book of the student
• ο βαθμός τριμήνου = the trimester grade

Greek often omits the article in expressions like this when the second noun works almost like a classifier or defining phrase.

So:

• βαθμός τριμήνου = trimester grade / term grade

This is natural Greek.

You could also find fuller versions in other contexts, such as:

• ο βαθμός του τριμήνου

That version is more explicitly the grade of the trimester. But in many fixed or common school-related phrases, Greek prefers the shorter form without the article.

Not exactly.

• σχολική επίδοση = school performance / academic performance
• βαθμός = grade / mark

So the sentence is making a distinction:

• a student’s overall academic performance affects
• the grade for the term

In other words, επίδοση is broader than a single βαθμός.

Yes. Greek word order is more flexible than English because case endings show grammatical roles.

The neutral, straightforward order here is:

• Η σχολική επίδοση επηρεάζει τον βαθμό τριμήνου.

But Greek could move things around for emphasis, for example:

• Τον βαθμό τριμήνου επηρεάζει η σχολική επίδοση.

That still means the same thing, because:

• η σχολική επίδοση is nominative = subject
• τον βαθμό is accusative = object

So case, not just word order, helps you understand the sentence.

A helpful pronunciation guide is:

• Η σχολική επίδοση επηρεάζει τον βαθμό τριμήνου
• roughly: ee skho-lee-KEE eh-PEE-tho-see eh-pee-re-A-zee ton vath-MO tree-MEE-noo

Stress falls on:

• σχολική → actually on the last syllable: σχολική
• επίδοση
• επηρεάζει
• βαθμό
• τριμήνου

A few notes:

• η / Η is pronounced ee
• θ sounds like th in think
• δ sounds like th in this
• γ before front vowels can sound softer than English g

Literally, yes: τρίμηνο means a three-month period.

In school contexts, it is often best translated as:

• term
• trimester
• grading period

depending on how the school system is organized.

So even though the literal meaning is trimester, the best English translation can vary by context.

Yes. Even if the meaning is already known, it helps to see how flexible the English can be. Possible translations include:

• Academic performance affects the term grade.
• School performance influences the trimester grade.
• A student’s academic performance affects the grade for the term.

The Greek itself is fairly formal and educational in tone.