5) BrainGym is some bullshit nonsense but it's used quite a lot in UK schools. Even though it is nonsense you could try a few of the exercises, because i) short breaks do help and ii) placebo effect.
With BrainGym you need to realise (it's pretty obvious) that it's nonsense, but maybe just taking a short break every now and again and doing some "exercises" will be useful, for some reason not connected to all the nonsense that braingym comes out with.