Increased Focus

Itotia stands around the cauldron, adding herbs (including lavender and chamomile) and water, making sure the temperature is steady. After 5 hours of work, Master Vaneesa comes in and adds the final touch - an ingredient so rare to find that the Master Apothecaries created their own farmland at the top of the Guild's tower. Even then, only several of the plants will fruit in a year. A rare ingredient plus long hours of finicky work makes this potion in very short supply, and expensive. 
  Master Vaneesa pats Itotia on the shoulder, "Well done." 
  Itotia just rolls her eyes before collapsing on a chair. "You just didn't want to stand there for so long," she grumbles. 
  "Glad you know it," Vaneesa smiles. 

  The Potion of Focus will support your mathematical endeavours. It gives a buff of focus for an amount of time, dependent on a person's usual stress levels, stamina and recent diet. The time averages on 33 minutes, with a standard deviation of 6 and a range of 56.  
 

How

By drinking a Potion of Focus your focus will improve for a short period. If the taste isn't to your taste, you may add it as in ingredient to a cake or pie (though the effect will decrease). The potion manages cortisol levels & interferes with the amygdala, thus decreasing stress and increasing one's ability to focus. This is both a biological and magical reaction.
 

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  Please note: the potion has only been tested on Lakamhaans with significant results. The sample size of Earth Travellers has been too small, furthermore there hasn't been any test without significant drawbacks. 
  Further note: The samples we have are from those who took it upon themselves to sneak a potion. The Guild of Apothecary's do not condone Earth consumption.