Меткость стала лучше.

Because меткость is a feminine singular noun, and the past tense of стать agrees with the subject in gender and number.

• он стал = he became
• она стала = she became
• оно стало = it became
• они стали = they became

So:

• меткость стала = accuracy became / got

Even though меткость is not a person, it is still grammatically feminine.

It is in the nominative case because it is the subject of the sentence.

The structure is:

• меткость = the thing being talked about
• стала = became
• лучше = better

So literally, the sentence is something like accuracy became better.

Because лучше is the comparative form meaning better.

After стать, Russian often uses this kind of comparative form:

• стать лучше = to become better
• стать хуже = to become worse
• стать сильнее = to become stronger

These forms do not agree in gender or number here. That is why you say:

• меткость стала лучше
• погода стала лучше
• жизнь стала лучше

not лучшая.

Стать means to become, while быть means to be.

So:

• Меткость стала лучше = Accuracy became/got better.
• Меткость была лучше = Accuracy was better.

The sentence is talking about a change of state, not just describing a state in the past. That is why стать is the right verb here.

Yes, it can be natural, especially in contexts like:

• shooting
• archery
• throwing
• games with character stats
• talking about someone’s aim improving

Меткость usually refers to accuracy in hitting a target, so it often sounds natural in those contexts.

In some situations, Russian speakers might also use other words depending on the exact meaning:

• точность = precision, accuracy in a broader sense
• прицел or phrases about aiming = if you mean aim more specifically

But меткость стала лучше is perfectly understandable and natural in the right context.

Yes. Меткость улучшилась is also correct and natural.

The difference is small:

• Меткость стала лучше = the accuracy got better
• Меткость улучшилась = the accuracy improved

Both work.
Улучшилась is a bit more compact and directly expresses improvement.
Стала лучше highlights the comparison with how it was before.

Russian has no articles, so there is no separate word for the or a.

Also, Russian often leaves out possessive words like my, his, or your if the context already makes them clear.

So Меткость стала лучше could mean:

• the accuracy got better
• my accuracy got better
• his/her accuracy got better
• the character’s accuracy got better

If you need to be specific, you can add a possessor:

• Моя меткость стала лучше = My accuracy got better
• Его меткость стала лучше = His accuracy got better

Yes, Russian word order is flexible, but the neutral order here is:

• Меткость стала лучше.

This sounds straightforward and natural.

Other orders are possible, but they change the emphasis:

• Лучше стала меткость. = emphasizes better
• Стала лучше меткость. = possible, but less neutral

For most learners, Меткость стала лучше is the safest and most natural version.

Меткость is a noun formed from меткий.

• меткий = accurate, true to the target, a good shot
• меткость = accuracy, marksmanship, ability to hit the target well

The ending -ость is a very common Russian way to make abstract nouns, similar to English endings like -ness or -ity.

Examples:

• мягкий → мягкость = softness
• яркий → яркость = brightness
• меткий → меткость = accuracy / marksmanship

The usual stress is:

• ме́ткость стала лу́чше

A rough pronunciation guide:

• ме́ткость ≈ MYET-kast’
• стала ≈ STA-la
• лу́чше ≈ LOOCH-she

A few useful notes:

• е after м sounds like ye
• о in unstressed position is reduced, so меткость does not sound exactly like it is spelled
• чш in лучше is pronounced like the chsh cluster in much-sh if said quickly

Usually меткость suggests hitting a target accurately rather than general precision in every possible sense.

So it is especially suitable for:

• shooting
• throwing
• archery
• game combat stats

If you mean broader accuracy, such as measurement or technical precision, точность is often a better word.

So the nuance of меткость is closer to aim, marksmanship, or accuracy in hitting than to broad scientific precision.