I wanted to do something like a video tutorial, but seems i don't have enough time, so i'll write something.
You need an hex editor (HxD -
http://mh-nexus.de/en/hxd/).
1) Install the hex editor
2) Run FIFA and then miniaturize it (Alt+Enter)
3) Open Hxd go to menù extra -> Open RAM
4) Select the FIFA 15 process
5) Now you opened it search for this string "WIDGETS/NUMBER"
6) After that string there are all career *.ini strings parameters
7)The structure is the following
02 00 00 00 00 00 00 00 XX 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 (43 41 52 45 45 52 4D 4F 44 45 5F 4D 41 4E 41 47 45 52 53 2F 44 45 42 55 47 53 54 41 54 53)= CAREERMODE_MANAGERS/DEBUGSTATS
the XX is the value, in that case 01 that are in hex base. 01 in hex = 01 in decimal base.
A little table of conversion is :
01h = 1
02h = 2
03h = 3
04h = 4
05h = 5
06h = 6
07h = 7
08h = 8
09h = 9
0Ah = 10
0Bh = 11
0Ch = 12
0Dh = 13
0Eh = 14
0Fh = 15
Youcan use the files i've extracted before as a reference. If you find float values like 6.80 or negative number then you will have to use a ieee 754 converter