Tax credit question please.

Hi, please could someone tell me how child tax credits are worked out. I have 3 children, 18, 12 and 9, and our annual earnings are £28674.
My eldest son has just left full time schooling. I advised HMRC of this and my tax credits have now been reduced from £72.58 to £22.04 per week. Is this correct as it does seem a very large drop. I'm thinking that going from 3 eligible children to 2 has taken me under some threshold, but would be very grateful if someone could confirm this is correct.
Many thanks.


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