Solution:For first letter of each word:
T + 2 = V, V + 2 = X, X + 2 = Z, Z + 2 = B,
B + 2 = D
For second letter of each word:
G - 2 = E,
E - 2 = C, C - 2 = A, A - 2 = Y, Y - 2 = W
For third letter of each word:
B + 2 = D, D + 2 = F, F + 2 = H, H + 2 = J, J + 2 = L
For fourth number series: addition of 12 after every term,
so 54 + 12 = 66