siken no zyunbi ha zyuntyou desu.

No. In normal Japanese, this would usually be written without spaces:

試験の準備は順調です。

Learning materials sometimes add spaces to show the word and particle boundaries more clearly. Native Japanese writing normally does not do this.

It is read:

しけん の じゅんび は じゅんちょう です。

Romanization:

shiken no junbi wa junchou desu

A small pronunciation note: the particle は is written ha but pronounced wa when it marks the topic.

Here is the breakdown:

• 試験 = exam, test
• の = links nouns; often shows possession or connection, like of or a noun modifier
• 準備 = preparation
• は = topic marker
• 順調 = going smoothly, proceeding well
• です = polite sentence ending / copula

So the structure is basically:

As for exam preparation, it is going smoothly.

の connects the two nouns and shows that 準備 is related to 試験.

So:

• 試験 = exam
• 準備 = preparation
• 試験の準備 = exam preparation / preparation for the exam

In English, we often use for here, but in Japanese の is very common for this kind of noun-to-noun relationship.

は marks the topic of the sentence.

So 試験の準備は means:

As for the exam preparation...

Then the rest of the sentence says something about that topic:

順調です = is going smoothly

This is a very common Japanese pattern:

X は Y です = As for X, it is Y

Japanese expresses this idea differently from English.

In English, we often say:

• Preparation is going well.
• Things are proceeding smoothly.

In Japanese, 順調 describes the state or condition, and です makes it a polite sentence:

• 順調です = is smooth / is going smoothly

So even though English uses a more verb-like expression, Japanese often uses a noun or adjective-like word plus です.

順調 is often treated as a na-adjective or an adjectival noun.

That means it can work like this:

• 順調です = it is going smoothly
• 順調な準備 = smooth preparation
• 順調に進む = to proceed smoothly

In this sentence, 順調です means the preparation is in a smooth or favorable state.

Grammatically, that is close to the structure, but it sounds unnatural in English.

A more natural English rendering would be:

• Preparation for the exam is going smoothly.
• The exam preparation is going well.

So the literal structure helps you understand the Japanese, but it is better not to force it into unnatural English.

Yes, 試験の準備が順調です is possible.

The difference is mainly about nuance:

• 試験の準備は順調です
  = As for the exam preparation, it is going smoothly.
  This sets exam preparation as the topic.

• 試験の準備が順調です
  = The exam preparation is what's going smoothly.
  This can sound a bit more focused on identifying what is smooth.

In many everyday situations, は is the more natural choice if you are simply talking about the general state of the preparation.

The sentence does not say.

Japanese often leaves that kind of information unstated when it is understood from context. Depending on the situation, it could mean:

• My exam preparation is going smoothly
• Your exam preparation is going smoothly
• The exam preparation is going smoothly
• His/Her exam preparation is going smoothly

Context tells you whose preparation it is.

By itself, 試験 does not clearly mark singular or plural.

So it could mean:

• the exam
• exams
• a test
• tests

In this sentence, English would often use the exam if the speaker and listener already know which exam they mean. But Japanese itself does not force that distinction.

Yes. It is polite because it ends with です.

A more casual version would be:

試験の準備は順調だ。

In conversation, people might also drop だ:

試験の準備は順調。

That sounds casual and conversational.

Here are the main forms:

• 試験の準備は順調です。
  = The exam preparation is going smoothly.

• 試験の準備は順調でした。
  = The exam preparation was going smoothly.

• 試験の準備は順調ではありません。
  = The exam preparation is not going smoothly.

• 試験の準備は順調ではありませんでした。
  = The exam preparation was not going smoothly.

Casual forms:

• 順調だ
• 順調だった
• 順調じゃない
• 順調じゃなかった

Yes. This is a very useful pattern:

X の 準備 は 順調です。 = Preparation for X is going smoothly.

For example:

• 旅行の準備は順調です。
  = Preparation for the trip is going smoothly.

• 発表の準備は順調です。
  = Preparation for the presentation is going smoothly.

• 引っ越しの準備は順調です。
  = Preparation for the move is going smoothly.

So this sentence is a good model you can reuse.