Expression: "Although he has got a lot of potential..."

[Tom]

Hi

Do you find the following sentence correct and natural? spoken by a teacher for her student

[Yankee]

Hi Tom

Your sentence is OK. My assumption is that your sentence is spoken by a teacher to the parent of a student (i.e. not to the student directly). If that's the case, you might also use one of these, for example:

- He has a lot of potential, but he doesn't take his studies seriously (enough).
- Although he has a lot of potential, his attitude towards his studies is having a negative effect on his progress/learning.
.

[Jamie (K)]

This is very natural, grammatical, oft-repeated sentence in English.