[Grammar] I can teach you better.

[emsr2d2]

Here, extra classes after school or extra-curricular learning centres would simply be called something like "extra tuition". Neither of them expresses the specific idea of "cramming" for an exam. As shown in the previously-linked definition, it refers to intensive study for an imminent exam.

I would expect a "cram school" (I keep putting it in quotes simply because it's not a term commonly used in my variant of English) to accept/tutor only students who are due to sit an exam in the next two to three weeks.

 

[kadioguy]

[...] (I keep putting in quotes simply because it's not a term commonly used in my variant of English)[...]

If you don't mind, should it be 'putting it in'?

 

[Tarheel]

Yes.

 

[emsr2d2]

If you don't mind, should it be 'putting it in'?

Yes, it should have been. Thanks for pointing that out. I've corrected the error.

 

[Tdol]

However, does the slogan sound (grammatically) OK and natural to native speakers?

Ironically, no.

 

[alexanderfinn]

Actually there is another meaning which she probably doesn't mean! She could be saying, 'I haven't taught you very well, but I can improve.'

 

[Tdol]

But that's quite an admission of guilt. ;-)

 

[Tarheel]

I haven't done it very well so far, but I can do better.

 

[Tdol]

I lived in a country where the teachers wouldn't teach the syllabus properly unless students coughed up some extra cash.

 

[Tarheel]

I lived in a country where the teachers wouldn't teach the syllabus properly unless students coughed up some extra cash.

:shock:

 

[Charlie Bernstein]

. . . . However, does the slogan sound (grammatically) OK and natural to native speakers? . . . .

To me it's a little ambiguous but not unnatural.