A Couple of Things.

Jutsu Count!

Each 'level' of a person has a certain amount of Jutsu they can use.

Genin -> 1 A rank Amount, which would be:
8 C In Total.
16 D In Total
32 E In Total

Chuunin -> 1 S Rank Amount
6 B In Total
10 C In Total
20 D in Total
40 E in Total

Jounin -> 3 S Rank Amounts
3 S In Total
6 A In Total
12 B In Total
24 C In Total
48 D In Total
96 E In Total ( I Don't think anyone's gonna do that...)

Carthesis 0 -> Same as Normal
Carthesis 1 -> 1/2 Times normal
Carthesis 2 -> Double normal
Carthesis 3 -> Quadruple Normal