Jeśli znowu będziemy robić nadgodziny w piątek, nie zdążę na szkolenie, chociaż jest obowiązkowe.

Both jeśli and jeżeli mean if and are usually interchangeable.

• jeśli is a bit more common in everyday speech
• jeżeli can sound slightly more formal or careful

So:

• Jeśli znowu będziemy robić nadgodziny...
• Jeżeli znowu będziemy robić nadgodziny...

Both are correct.

Because robić is an imperfective verb, its future is formed with:

• future of być
  • infinitive

So:

• będziemy robić = we will be doing / we will do

This structure often suggests an ongoing or repeated activity rather than one completed action.

Here it fits well because doing overtime is viewed as an activity, not as one single finished event.

Compare:

• będziemy robić nadgodziny = we’ll be doing overtime
• zrobimy coś = we’ll do something / finish doing something

Usually no, or at least it would sound unnatural in this context.

The usual expression is:

• robić nadgodziny = to work overtime / do overtime

Using perfective zrobić here is not the normal choice, because overtime is treated as a work activity rather than a completed object-like action.

So będziemy robić nadgodziny is the idiomatic version.

In Polish, nadgodziny is normally used in the plural, just like English often uses overtime hours in a countable sense.

• nadgodzina = one overtime hour
• nadgodziny = overtime / overtime hours

After robić you use the accusative plural, and for this noun the form looks the same as the nominative plural:

• robić nadgodziny

So even though English often says just overtime, Polish commonly uses the plural noun.

Because w + accusative is the normal way to say on Friday for a specific day of the week.

• w piątek = on Friday
• w poniedziałek = on Monday
• w sobotę = on Saturday

Notice that some weekday forms look different in the accusative:

• piątek → w piątek
• sobota → w sobotę

So w piątek is the standard form here.

Zdążyć is a perfective verb meaning to manage to be in time / to make it in time. Perfective verbs form the future with a single present-looking form:

• zdążę = I will make it in time
• nie zdążę = I won’t make it in time

This is very common in Polish:

• perfective present form = future meaning

So although it looks like present tense, it actually refers to the future here.

Nie będę zdążać would use the imperfective verb zdążać, but that verb is much less natural for this meaning in this sentence.

The pattern is:

• zdążyć na + accusative

It means to make it in time for something.

So:

• zdążę na szkolenie = I’ll make it to the training in time
• nie zdążę na szkolenie = I won’t make it to the training in time

This is a very useful structure:

• zdążyć na autobus = to catch the bus / make it to the bus in time
• zdążyć na spotkanie = to make it to the meeting in time

Because Polish uses different prepositions depending on the meaning.

• na szkolenie suggests going to an event or activity
• do usually means movement into a place or to a destination understood more as a location/container

A training session is treated as an event, so:

• iść na szkolenie = to go to a training session
• zdążyć na szkolenie = to make it to the training in time

This is similar to:

• na spotkanie = to a meeting
• na koncert = to a concert
• na lekcję = to class

Because obowiązkowe agrees with szkolenie.

• szkolenie is neuter singular
• so the adjective must also be neuter singular

That gives:

• obowiązkowe

Compare:

• kurs jest obowiązkowy — masculine
• lekcja jest obowiązkowa — feminine
• szkolenie jest obowiązkowe — neuter

Chociaż means although / even though.

It introduces a contrast:

• nie zdążę na szkolenie = I won’t make it to the training
• chociaż jest obowiązkowe = although it is mandatory

So the idea is: even though the training is mandatory, overtime may prevent the speaker from getting there in time.

You could also see:

• mimo że = although / even though

For example:

• ..., mimo że jest obowiązkowe.

That would also be correct.

It refers to szkolenie.

Polish often leaves out pronouns like it when the reference is clear from context. So instead of saying something like chociaż ono jest obowiązkowe, Polish normally just says:

• chociaż jest obowiązkowe

The adjective obowiązkowe also helps show that the missing subject is something neuter singular, which matches szkolenie.

Because Polish usually drops subject pronouns when the verb ending already shows who the subject is.

• będziemy = we will
• zdążę = I will

So:

• (my) będziemy robić
• (ja) nie zdążę

The pronouns my and ja are normally unnecessary unless you want emphasis or contrast.

For example:

• Ja nie zdążę, ale oni tak. = I won’t make it, but they will.

Because Polish uses commas to separate subordinate clauses.

Here the sentence has three parts:

1. Jeśli znowu będziemy robić nadgodziny w piątek
2. nie zdążę na szkolenie
3. chociaż jest obowiązkowe

So commas are needed:

• after the if-clause
• before the although-clause

This is standard Polish punctuation.

Yes. Polish word order is flexible, though some versions sound more natural than others.

Original:

• Jeśli znowu będziemy robić nadgodziny w piątek, nie zdążę na szkolenie, chociaż jest obowiązkowe.

Possible variants:

• Nie zdążę na szkolenie, jeśli znowu będziemy robić nadgodziny w piątek, chociaż jest obowiązkowe.
• Jeśli w piątek znowu będziemy robić nadgodziny, nie zdążę na szkolenie...

Changing the order can shift emphasis:

• znowu emphasizes again
• w piątek can be moved earlier for focus on Friday

But the original sentence is very natural and neutral.

Yes, znowu and znów both mean again.

• znowu is very common in everyday speech
• znów is slightly shorter and can sound a bit more literary or compact, but it is also common

So these are both fine:

• Jeśli znowu będziemy robić nadgodziny...
• Jeśli znów będziemy robić nadgodziny...

As for position, znowu usually goes near the verb or before the part it modifies. In this sentence it naturally modifies the whole situation of doing overtime again.