What does 2.668 convert to grade wise?

2.668 doesn't directly convert to a grade. A numerical score like that needs context. To convert it to a letter grade or a percentage, you need to know:

* The grading scale: Is it a 4.0 scale (common in colleges), a 5.0 scale, a 100-point percentage scale, or something else?

* The maximum possible score: Was 2.668 out of 4, out of 5, out of 10, or some other maximum?

Once you provide this information, the conversion can be made.