Corneia thickness. This thing happens.

Hello My eye power was 3.0 spherical and  1.50 cylinder in Right  and 2.50sph  and 1.0 cylinder in left eyes   That was almost costant for last 4 years.This change to 3.75 spherical and 3.0 cylinder in Right and 2.0 spherical and 1.75 in left eyes in 4-5 month . I consulted with doctor he said not to worry it's just you are wearing wrong power glasses and sitting in back in class  there's no disease. I also agree bcz I started taking my coaching classes and have to sat far from study boards. Then I started to sit near board in my class. I have another normal check up with other places and he said you have keratoconus disease and my corneia thickness reduced to 396 and 416 micrometer but I need at least 425 to pass my Job medical exam which is schedule next year in December I have more than 1 year for medical.          Please give some suggestions to me adjust my corneia thickness to above 425 It's all about my career I am working hard for this in last 2 yrs and this thing happens.