A profissional eficiente vai revisar o relatório amanhã de manhã.

Because profissional is a common-gender noun in Portuguese. The noun itself stays the same for men and women, and the article shows the gender:

• o profissional = the male professional
• a profissional = the female professional

This is very common in Portuguese. So profissional does not become something like profissionala.

Many Portuguese adjectives have one form for both masculine and feminine, especially adjectives ending in -e. So:

• o profissional eficiente
• a profissional eficiente

In both cases, eficiente stays the same. Only some adjectives change form, such as:

• eficiente → no change
• bonito / bonita → changes

Here, a is the definite article, meaning the.

So a profissional eficiente means the efficient professional.

It also tells you the noun is feminine singular. In this sentence, a is not a preposition; it is simply the article.

In Portuguese, adjectives often come after the noun. So profissional eficiente is the most neutral and natural order.

Compare:

• a profissional eficiente = the efficient professional
• a eficiente profissional = possible, but more literary, emphatic, or less natural in everyday speech

So for normal Brazilian Portuguese, noun + adjective is the safest pattern.

Vai revisar is the structure ir + infinitive, which is a very common way to talk about the future in Brazilian Portuguese.

• vai = goes / is going
• revisar = to review / revise

Together, vai revisar means will review or is going to review.

This is one of the most common future forms in spoken Brazilian Portuguese.

Yes. A profissional eficiente revisará o relatório amanhã de manhã is also correct.

The difference is mostly about style and frequency:

• vai revisar = very common in speech, natural, everyday Brazilian Portuguese
• revisará = simple future; correct, but often sounds more formal, written, or official

In conversation, Brazilians usually prefer vai revisar.

O relatório means the report, so it refers to a specific report that is already known from the context.

• o relatório = the report
• um relatório = a report

If the speaker means a particular report, o relatório is the natural choice. If it were any report, or one not yet identified, um relatório would make more sense.

Amanhã de manhã means tomorrow morning.

It combines:

• amanhã = tomorrow
• de manhã = in the morning / in the morning time

So:

• amanhã = tomorrow
• de manhã = in the morning
• amanhã de manhã = tomorrow morning

Using both makes the time very clear.

Yes. De manhã is a very common time expression meaning in the morning.

Other similar expressions are:

• de tarde = in the afternoon
• à tarde = in the afternoon
• de noite = at night / in the evening
• à noite = at night

So even though de manhã is literally something like of morning, you should learn it as a natural expression meaning in the morning.

The word order is flexible. The sentence given is very natural, but you can move the time expression:

• A profissional eficiente vai revisar o relatório amanhã de manhã.
• Amanhã de manhã, a profissional eficiente vai revisar o relatório.

Both are correct. Putting amanhã de manhã at the beginning gives it a little more emphasis.

Yes, depending on context. Revisar can mean things like:

• review
• check
• revise
• proofread
• inspect

With relatório, it often means review or go over carefully, and sometimes revise/edit if changes are expected. The exact English translation depends on the situation.

Not necessarily. Even though this form is often called the near future, in real Brazilian Portuguese it is used very broadly for future actions, not only for something happening soon.

So vai revisar can mean:

• a planned future action
• an expected future action
• sometimes simply will review

In this sentence, the time phrase amanhã de manhã makes the timing explicit anyway.