Why do you used black paper ? To me, black, being the same color as the type, would compete for my eyes' attention.

If you are struggling to pull the information into your mind, you could try reading aloud. That can help your brain absorb the material studied.

Sometimes, the brain gets fatigued by the strain to grasp the material read.

You could also take notes of what you are reading. The term for this is 'multi-sensory learning.' You take a visual learning task and make it auditory bu reading aloud and tactile by writing it down.

It may be worth experimenting with different background sounds. If you brain is trying to also pay attention to the ambient sounds, there may be a sound it can ignore. For me, a CD or playlist of music that I have heard many times before allows my brain to let go of auditory stimulation because it already knows the music and what to expect. Keeping the same order is helpful. Shuffling the music does not work for me.

I struggled with this for a few years and still struggle with certain tasks.

Can your Kindle read the words into ear buds so you can read along ? It would be worth a try.

I know it can be frustrating to find the work arounds but keep trying.

My best to you.