Aww Mrs Fogi,I hope you don't mind me saying but I feel you are worrying way too much (Have posted on other thread)
If it is any help ds is in reception and his teacher has reccommended the "Education city" website for things mathematical
Honestly,in pre school the really important thing is play.In Scandinavian countries children do not start formal schooling until 7 iirc.They have better education results than in this country.It will come togetherAll children are different,it isn't a race.The main thing at pre school is that they are happy and forming social relationships IMHO