This school program is weird. Not how I learned to read at all, and I'm familiar with five different writing systems (Roman, Cyrillic, Greek, Arabic, and Katakana). Honestly, this is giving me flashbacks to a horrible curriculum that used to be all the rage in America: Hooked on Phonics. It was such a disaster that it became the butt of a rather famous joke:

HUKT ON FONIX WURKT FOR ME

"Hooked on Phonics worked for me." No it didn't, it didn't work for anyone. Oh, one other thing: when a particular consonant goes from voiced to voiceless in English, the letter actually changes if it isn't at the end of a word. Thus, the noun form of the verb "transcribe" is "transcription." On that same token, if a word ends in a voiced consonant, that consonant usually remains voiced in its pronunciation (unlike in Russian), though there are plenty of exceptions. English has many more exceptions to the rules than rules to begin with (e.g. why is the suffix "-tion" pronounced "шан"?!), it's maddening.