His degree, for instance, was not particularly good, and his discipline, though enough good and improving, was not absolutely reliable under all conditions.

Explanation

The phrase "enough good" is grammatically incorrect. The correct form is "good enough." This adjustment ensures proper word order and maintains the intended meaning. The corrected sentence is: His degree, for instance, was not particularly good, and his discipline, though good enough and improving, was not absolutely reliable under all conditions.