If you want to focus your mind, try this....
My mind is in need of some sharp focus at the moment....
Here's a tip to help you get 'in the zone' of focus....(it works for me, anyway)...
1/ Play chess, (online) at a level that challenges you - but doesn't require too much study...
...and then....... at the same time
2/ Play poker with a money amount that means something, but not too much. (I use between $1 and $5 stake sit 'n go - 9 players)
It's like a icy blast of focused fresh air running through your noggin'....