Εγώ πετυχαίνω καλύτερο αποτέλεσμα όταν διαβάζω λίγο κάθε μέρα και όχι μόνο πριν από το μάθημα.

Yes. Πετυχαίνω already tells you the subject is I, because it is the 1st person singular form.

Greek often drops subject pronouns, so πετυχαίνω καλύτερο αποτέλεσμα... would also be correct.

When εγώ is included, it usually adds emphasis, contrast, or a more personal tone, like:

• As for me, I get better results...
• I get better results...

So here Εγώ is not required for grammar; it is there for stress/emphasis.

Here πετυχαίνω means something like:

• I achieve
• I get
• I obtain

So πετυχαίνω καλύτερο αποτέλεσμα is literally I achieve a better result, but in natural English it may be translated as I get better results or I do better.

This verb can also have other meanings in different contexts, such as:

• to succeed
• to hit/reach
• to manage to

But in this sentence, it means to achieve/get a better outcome.

Because καλύτερο is an adjective agreeing with αποτέλεσμα.

• αποτέλεσμα = a neuter singular noun
• so the adjective must also be neuter singular
• therefore: καλύτερο αποτέλεσμα

Καλύτερα is different. It is often used as:

• an adverb: better
• or a neuter plural/comparative form in other structures

But here we need an adjective modifying a singular noun, so καλύτερο is correct.

Greek often uses the singular where English might prefer a plural.

So:

• καλύτερο αποτέλεσμα = literally a better result/outcome
• but in natural English, this may be translated as better results

The Greek singular here refers to the overall outcome or performance. It sounds natural and idiomatic.

Yes, διαβάζω basically means I read, but in Greek it is also very commonly used to mean I study, especially in school/university contexts.

So depending on context:

• διαβάζω ένα βιβλίο = I’m reading a book
• διαβάζω για το μάθημα = I’m studying for class/the lesson

In this sentence, because of κάθε μέρα and πριν από το μάθημα, the meaning is clearly study, not just read.

Here λίγο is being used adverbially, meaning a little.

It modifies the verb διαβάζω:

• διαβάζω λίγο = I study a little

If you used λίγα, that would normally go with a plural noun, for example:

• λίγα βιβλία = a few books

So:

• λίγο = a little amount / a bit
• λίγα = a few things (plural)

Because κάθε means each/every, and with κάθε Greek normally does not use the article.

So:

• κάθε μέρα = every day
• κάθε εβδομάδα = every week
• κάθε φορά = every time

Using an article here would not be the normal pattern.

Also, μέρα is in the singular after κάθε, just like in English:

• every day
• not every days

Because the sentence describes a habitual/repeated situation:

• when I study a little every day, I get better results

Greek uses the present tense here for something that happens regularly or generally, not just right now.

So όταν διαβάζω here means:

• when(ever) I study
• when I am in the habit of studying

It is not talking about one single future event. If it were about a specific future occasion, Greek would use a different structure.

Όταν means when.

In this sentence, it introduces the time clause:

• όταν διαβάζω λίγο κάθε μέρα = when I study a little every day

Because the sentence is about a general pattern, όταν can feel close to whenever in English:

• Whenever I study a little every day, I get better results

So όταν can refer either to:

• a specific when
• or a more general whenever, depending on context

και όχι μόνο means and not only / and not just.

Here it adds a contrast:

• λίγο κάθε μέρα
• και όχι μόνο πριν από το μάθημα

So the idea is:

• I get better results when I study a little every day, and not only before class

The speaker is contrasting:

1. regular study
2. last-minute study right before the lesson/class

This is a very natural Greek way to express not just X, but rather more broadly Y.

Πριν από means before.

You will often see both:

• πριν το μάθημα
• πριν από το μάθημα

Both are common and correct. Από is very often included, especially in slightly fuller or more careful style.

After πριν από, the noun goes in the accusative:

• το μάθημα (accusative/neuter singular, same form as nominative here)

So:

• πριν από το μάθημα = before the lesson/class

It can mean different things depending on context:

• lesson
• class
• course
• subject

In this sentence, πριν από το μάθημα most naturally means:

• before class
• or before the lesson

If the context is school or tutoring, either translation could work. Greek μάθημα is a bit broader than any one single English word.

Yes, Greek word order is more flexible than English word order.

For example, you could also say:

• Πετυχαίνω καλύτερο αποτέλεσμα όταν διαβάζω λίγο κάθε μέρα...
• Καλύτερο αποτέλεσμα πετυχαίνω όταν διαβάζω λίγο κάθε μέρα...

These changes can affect emphasis or style, but the basic meaning stays the same.

The original sentence sounds natural and clear, with a straightforward flow: Εγώ πετυχαίνω καλύτερο αποτέλεσμα όταν διαβάζω λίγο κάθε μέρα και όχι μόνο πριν από το μάθημα.