Just Can’t Focus on my work or right here right now?
You really didn’t give enough information to assess why you might be struggling. Is this a change in behavior? If so anything traumatic going on in your life? Are you using drugs or alcohol? Do you like what you are studying?
Fear of success? Fear of failure?
For some of us, focusing is a “learned skill”, which we employ to greater or lesser extent. Provide us with more information for specific suggestions.
S/he can’t focus enough to answer.
Turn off your phone. Put it away in a drawer for 2-3 hours while you study at the library. The world will continue, and your concentration and grades will improve.