Reddit reviews The Ghost in My Brain: How a Concussion Stole My Life and How the New Science of Brain Plasticity Helped Me Get it Back

You're mostly thinking about brain games, not brain training. Brain training aims at increasing neuroplasticity which is the difference. Check out this meta-analysis from 2017:

>Out of 18 identified programs, 7 programs were investigated in 26 studies including follow-ups. Two programs were identified as possessing Level I evidence, three programs demonstrated Level II evidence and an additional two programs demonstrated Level III evidence. Overall, studies showed generally high methodological quality (average PEDro score = 7.05). Although caution must be taken regarding any potential bias due to selective reporting, current evidence supports that at least some commercially available computerized brain training products can assist in promoting healthy brain aging.

Enhancing Cognitive Functioning in Healthly Older Adults: a Systematic Review of the Clinical Significance of Commercially Available Computerized Cognitive Training in Preventing Cognitive Decline

Those two programs that are Level I (the best) are

brainhq.com and
cognifit.com

>"The publication of high quality studies of commercially available programs has really accelerated over the past five years," Professor Martins said. "The evidence now supports the notion that the human brain is plastic in later life and can benefit from properly designed brain training programs."

https://www.gizmodo.com.au/2017/02/the-brain-training-programs-that-actually-work/

I added dsmexercises because it's a site that no one really knows about but I think works. It's mentioned in the book Ghost in my Brain

http://www.chicagotribune.com/lifestyles/health/ct-x-0321-expert-markus-20120321-story.html

http://www.abc.net.au/radionational/programs/allinthemind/clark-elliot-the-ghost-in-my-brain/7391502

Try them and you'll feel like your brain is getting a workout. I swear

From hearing that you have had problems with your eyes, I'd highly recommend this book - https://www.amazon.com/Ghost-My-Brain-Concussion-Plasticity-ebook/dp/B00OZ0TOLC

It's an inspiring story by an remarkable professor who documents his journey after getting in a car accident and suffering a concussion. Vision therapy worked wonders for him. I think I've seen someone on this sub take time off from work/school to travel to the same center he went to so that is an option. Conversely if you went to your local optometrist they would no doubt have recommendations for local vision therapy centers. Here's a fairly recent study documenting the successes of vision therapy.

https://www.ncbi.nlm.nih.gov/pubmed/27505624

I really wish you the best. I'm nowhere near you in life so I may not be qualified to give advice but if I did I'd say that school is secondary to you feeling better. I'm not as familiar with graduate programs as I am undergrad, but if you can take time off without repercussions I would highly recommend it. Concussions are no joke, as you know. But the brain does heal. Good luck friend!