I am suffering from such problems as difficulty with being focused on sth and difficulty with learning. i also have a tense neck.would it be neurosis?

Maybe : While "anxiety neurosis" is possible so is a learning disorder or the adult form of ADHD which can then make you tense and stressed. Please consult a doctor so that a referral can be done and/or a diagnosis made

Anxiety: These symptoms are consistent with anxiety and chronic tension. You shouldn't try to fight through this without expert help as your physical health will also suffer. Ask your physician to refer you for stress management therapy by a psychologist(can't prescribe medication) or a psychiatrist who may prescribe it for short term.