I have been trying to learning English as a student these days. It is not an easy task. I have discovered that I lack a lot of patience and concentration. I can't be a good student yet but I will manage to become one. Your made only one error: "student", not "students" You can also say: "It is no easy task" You can omit "a lot of"

I have been trying to learn English these days. It's not an easy task. I find out that I lack a lot of patience and concentration. I'm not a good student yet. But I will do it.

I have been trying to learn English as a student these days. It is not an easy task. I discovered/realized that I lack patience and concentration. I can't be a good student yet but I will manage become one.

I have been trying to learning English as a student these days. It is not an easy task. I discovered that i have alot of patience and concentration. I am not a good student yet but I will manage to do it.

I have been trying to learn English as a student these days. This is not a simple task. I discovered that I am very impatient and unable to concentrate. Although I am not yet a good student, I am committed to improving.