What can i do to improve my concentration?

Several things: First make sure your help is optimized, I notice that you are on 2 very potent immunosuppressants - have you had an organ transplant? You need to make sure you are well rested, minimizing stress, eating well and remaining physically active. You need to minimize distractions. Make sure you don't give up easily. Focus on one thing at a time, don't try to multitask too much. This is just a start