Moja mentorica kaže da je dobra praksa važnija od savršene ocjene, jer na poslu učiš drukčije nego na fakultetu.

Because moja has to agree with mentorica in gender, number, and case.

• mentorica is feminine singular nominative
• so the possessive my must also be feminine singular nominative: moja

Compare:

• moj mentor = my male mentor
• moja mentorica = my female mentor

Mentorica is the feminine form of mentor.

So:

• mentor = a male mentor
• mentorica = a female mentor

In modern Croatian, feminine job/person words like učiteljica, profesorica, ravnateljica, mentorica are very common and natural when referring to a woman.

After verbs like kaže (says), Croatian often uses da to introduce a subordinate clause:

• Kaže da... = She says that...

The je is the present-tense form of to be, needed because the clause says:

• dobra praksa je važnija = good practice is more important

So the full structure is:

• kaže da je dobra praksa važnija...
• she says that good practice is more important...

Because je is a clitic in Croatian, and clitics usually go in the second position of their clause.

So in the clause:

• da je dobra praksa važnija...

the clitic je appears very early, right after da.

This can feel strange to English speakers, because English would usually keep is after the subject:

• that good practice is more important

But in Croatian, da je dobra praksa... is completely normal.

In this sentence, praksa most likely means practical experience, hands-on work, or real-world practice, not just practice in the abstract English sense.

Because the sentence contrasts:

• praksa
• with savršena ocjena
• and then talks about learning at work versus at university

So here dobra praksa suggests something like:

• solid practical experience
• good hands-on training
• useful real-world practice

Važnija is the comparative of važna (important, feminine form).

Base adjective:

• važan = important (masculine)
• važna = important (feminine)
• važno = important (neuter)

Comparative:

• važniji = more important (masculine)
• važnija = more important (feminine)
• važnije = more important (neuter)

Here it is važnija because it agrees with praksa, which is feminine:

• praksa je važnija

Croatian often uses od + genitive after a comparative adjective.

So:

• važnija od... = more important than...

Here:

• od savršene ocjene = than a perfect grade

Why these endings?

• savršena ocjena is nominative
• after od, it changes to genitive
• so it becomes savršene ocjene

This is a very common pattern:

• bolji od mene = better than me
• veći od kuće = bigger than the house
• važnija od ocjene = more important than a grade

Because the whole phrase is in the genitive singular feminine.

The base form is:

• savršena ocjena = a perfect grade

After od, both words change:

• savršena → savršene
• ocjena → ocjene

So:

• od savršene ocjene = than a perfect grade

This is adjective-noun agreement at work again: the adjective must match the noun.

Not necessarily. Croatian often uses 2nd person singular the same way English uses you in a general sense.

So:

• na poslu učiš drukčije nego na fakultetu

can mean:

• you learn differently at work than at university
• but really in the general sense of people learn differently

It does not have to mean the speaker is addressing one specific person.

Jer means because.

So:

• ..., jer na poslu učiš drukčije...
• ..., because at work you learn differently...

Yes, zato što can often also mean because:

• ..., zato što na poslu učiš drukčije...

Both are common.
Very roughly:

• jer is shorter and very common in everyday speech
• zato što can sound a little fuller or more explicit

In this sentence, jer is perfectly natural.

Because Croatian uses certain prepositions idiomatically with places and institutions.

• na poslu = at work
• na fakultetu = at university / at the faculty

These are the normal expressions for the intended meaning.

By contrast:

• u poslu usually means something more like in the work / in the business / involved in the task
• u fakultetu is not the normal way to say at university in this context

So this is something you mostly learn as a set phrase:

• na poslu
• na fakultetu
• also often na poslu, na sudu, na moru, etc., depending on the expression

They both mean differently or in a different way.

So in this sentence:

• učiš drukčije could also be:
• učiš drugačije

Both are standard and natural. Some speakers prefer one over the other depending on region or personal habit, but for a learner, the important thing is that the meaning is basically the same.

Because nego is commonly used when comparing the way something happens or comparing with an implied clause/situation.

Here the idea is:

• You learn differently at work than you do at university

Croatian shortens that to:

• drukčije nego na fakultetu

So:

• nego = than

A useful contrast is:

• važnija od ocjene = more important than a grade
  
  • comparative adjective + od
    • noun phrase
• drukčije nego na fakultetu = differently than at university
  
  • adverb/comparison of manner + nego

Not usually in the way English speakers first expect.

In everyday Croatian, fakultet often refers to:

• a university faculty/department
• or more generally university studies / college

So:

• Idem na fakultet usually means I go to university / I’m in college
• na fakultetu often means at university

It does not usually mean the teaching staff or the faculty in the English-American sense. That is a classic false friend for English speakers.