My son has always found Maths most energy draining of the (very few) subjects he is studying (home tutored). I asked for his Maths tuition slot to always be shorter than his other slots to take this into account.
Before he was well enough to have home tutors I used MyMaths with him for tiny amounts (literally a few minutes).
One immediate physical sign I get that he is up to his max is that his left eye goes distinctly bloodshot. I don't know if anyone else has had this effect?? He also used to get it with gaming (another intense/focused activity) although he no longer games. Ditched it as just not a good use of precious energy. Its always the left eye not the right.
Before he was well enough to have home tutors I used MyMaths with him for tiny amounts (literally a few minutes).
One immediate physical sign I get that he is up to his max is that his left eye goes distinctly bloodshot. I don't know if anyone else has had this effect?? He also used to get it with gaming (another intense/focused activity) although he no longer games. Ditched it as just not a good use of precious energy. Its always the left eye not the right.