Large discrepancy between subtest scores on WAIS-IV. Any advice on narrowing the gap?

So I don't remember my cumulative score but my VCI was 149 and my PSI was in the low 80s. I don't remember my other scores since my proctor was so wigged out about those two, but I know that on the math bits I did poorly enough on some sections to be diagnosed with dyscalculia and well enough on others that the lady who administered the test said she'd never seen ones as high as mine. Specifically I did very well on the math -reasoning tests which utilised diagrams and scales and such instead of actual numbers.

Anyway, I know the dyscalculia probably can't be helped, and I'm not particularly hurting to help it, but does anyone know if it's possible to train processing speed at all? I think my low processing speed is what caused the issues that led me to seek IQ testing in the first place. I feel so stupid and lethargic all the time. If anyone knows of any strategies I can use to mitigate the effects of my low PSI they would be much appreciated!

I have also been diagnosed with ADHD and a few mood/anxiety disorders. I'm 16, if that matters.