The ability to focus and maintain selective attention requires many parts of your brain to be working well. Gaze stability, keeping your eyes steady on each word as you read and jump from word to word. The ability to tune out distracting environmental stimuli as you focus on a task. Auditory processing, identifying tone and pitch of a new language through the cochlea, temporal and frontal lobes. Then the ability to retain and apply what you have just learned. All of these involve different regions of the brain which work together to allow us to learn new things. Receiving a comprehensive physical and neurological exam is a good place to start to check if there are any obvious underlying health conditions which are contributing to this. In my office I frequently use a test called videonystagmography and saccadometry which can objectively measure your gaze stability and visual tracking abilities. I then perform a baseline concussion test with C3 logix which is an cost effective screening for cognitive functions, reaction times, processing speed, etc. If you don't have a chiropractic neurologist in your area who provides this type of service, I would start with an online reading program called "Reading Plus". If this training doesn't help I would seek out the closest chiropractic neurologist in your area or consult a neuropsychologist. you can learn more about diagnostic testing for brain rehabilitation here: http://sfchiro.com/diagnostics-for-concussion-brain-injury/