Ako dobro uvježbam prezentaciju, govorit ću sažeto i mirnije.

Croatian often drops subject pronouns when they are not needed, because the verb form already shows the person.

• uvježbam = I rehearse / I practice
• ću in govorit ću = I will

So Ako dobro uvježbam prezentaciju, govorit ću sažeto i mirnije naturally means If I rehearse the presentation well, I will speak concisely and more calmly, even without ja.

You could add ja for emphasis:

• Ako ja dobro uvježbam prezentaciju, govorit ću sažeto i mirnije.

But in normal speech, it is usually left out.

Ako means if. It introduces a condition.

So the structure is:

• Ako... = If...
• main clause = what will happen if that condition is met

Here:

• Ako dobro uvježbam prezentaciju = If I rehearse the presentation well
• govorit ću sažeto i mirnije = I will speak concisely and more calmly

This is a very common learner question because it involves aspect.

• uvježbati is perfective
• uvježbavati is imperfective

The form uvježbam is the present tense of a perfective verb, but in sentences like this it refers to a future completed action:

• Ako dobro uvježbam prezentaciju...
  = If I manage to rehearse/practice the presentation well / If I get it well rehearsed...

The idea is that the rehearsal will be completed first, and then the result follows.

If you used uvježbavam, it would sound more like an ongoing or repeated process, not a single completed preparation leading to the result.

So in conditional sentences about the future, Croatian very often uses:

• ako + present of a perfective verb

That is normal and natural.

Because it is the direct object of uvježbam.

The basic noun is:

• prezentacija = presentation

Here it appears as:

• prezentaciju

That is the accusative singular, which is the case normally used for a direct object.

So:

• uvježbam prezentaciju = I rehearse the presentation

This is a regular pattern with many feminine nouns ending in -a:

• nominative: prezentacija
• accusative: prezentaciju

This is the future tense.

Croatian future I is formed with:

• the verb htjeti in its short/clitic form
• plus the infinitive

For I will, the clitic is ću.

With govoriti, you can have:

• govorit ću
• ja ću govoriti

When the clitic comes after the infinitive, the final -i of the infinitive is usually dropped:

• govoriti + ću → govorit ću

So govorit ću is correct and standard.

You should not normally write:

• govoriti ću

Instead use either:

• govorit ću
• ću govoriti

Here dobro is an adverb, meaning well.

It modifies the verb uvježbam:

• dobro uvježbam = rehearse well

This is not the adjective dobar/dobra/dobro meaning good in the sense of describing a noun. In this sentence, it describes how the action is done, so it is adverbial.

Compare:

• dobra prezentacija = a good presentation
• dobro uvježbam prezentaciju = I rehearse the presentation well

Because they describe how the speaker will speak, so they function as adverbs, not adjectives.

• sažeto = concisely / succinctly
• mirnije = more calmly

They modify the verb:

• govorit ću sažeto i mirnije = I will speak concisely and more calmly

If you used adjective forms, they would need to describe a noun, not the act of speaking.

A useful comparison:

• sažeta prezentacija = a concise presentation
• govoriti sažeto = to speak concisely

And:

• miran govornik = a calm speaker
• govoriti mirnije = to speak more calmly

Yes. Mirnije is the comparative form, meaning more calmly.

It comes from:

• mirno = calmly
• mirnije = more calmly

So the sentence implies a comparison, even if the second thing is not stated directly:

• more calmly than before
• more calmly than if I were unprepared
• more calmly than usual

This is very natural in Croatian. The comparison does not always need to be spelled out.

Because the sentence begins with a subordinate clause introduced by ako.

Structure:

• Ako dobro uvježbam prezentaciju, = subordinate conditional clause
• govorit ću sažeto i mirnije. = main clause

In Croatian, when the if-clause comes first, it is normally separated from the main clause by a comma.

So the punctuation here is standard.

Yes, Croatian word order is fairly flexible, though not completely free.

You can also say:

• Govorit ću sažeto i mirnije ako dobro uvježbam prezentaciju.

That means the same thing.

The original version puts the condition first, which is often natural when you want to emphasize the cause or requirement:

• If I rehearse well, then I will speak better

Croatian word order can shift for emphasis, rhythm, or information structure, but some elements, especially short forms like ću, follow clitic-placement rules. So not every rearrangement will sound equally natural.

Not exactly.

• vježbati = to practice, to exercise, often in a general or ongoing sense
• uvježbati = to practice thoroughly, to rehearse until ready, with a sense of achieving a result

In this sentence, uvježbam prezentaciju suggests:

• I practice the presentation enough to get it properly prepared

So uvježbati is a very good choice here, because it matches the idea that good rehearsal leads to better speaking.