If a child has achieved all the ELGs in reception (either while still in reception or when starting Y1) they will begin working towards level 1 NC following the NC programme. In order to achieve a 1C they need to meet NC criteria
Reading book levels/bands would contribute to the teacher's assessment but would only be a small part of the evidence the teacher would use to award levels.
Reading level 1
In some reading, usually with support:
some high frequency and familiar words read fluently and automatically
decode familiar and some unfamiliar words using blending as the prime approach
some awareness of punctuation marks, e.g. pausing at full stops
some simple points from familiar texts recalled
some pages/sections of interest located, e.g. favourite characters/events /information/pictures
reasonable inference at a basic level, e.g. identifying who is speaking in a story
comments/questions about meaning of parts of text, e.g. details of illustrations diagrams,
changes in font style
some awareness of meaning of simple text features, e.g. font style, labels, titles
comments on obvious features of language, e.g. rhymes and refrains, significant words and phrases
some simple comments about preferences, mostly linked to own experience
a few basic features of well-known story and information texts distinguished, e.g. what typically happens to good and bad characters, differences between type of text in which photos or drawings used