Just for your interest...
A lot of schools have more than one type of reading scheme running along side each other, to add interest and to cater for different tastes and styles (some focus on whole word approaches, some are designed to promote phonetics etc etc). The levels of different published schemes (eg Ginn ORT Rigby Star) don't usually correlate, so many schools use the 'Cliff Moon' colour-coding system - a big book that lists all the different reading scheme titles, and lots of 'real' books and puts them into colour bands of difficulty/readability.
Some schools prefer to stick to one scheme which is rigidly applied to with children only going up a level once they can read all the words of the books out of context. Other schools use a mixed approach giving children a range of books, some which they can read easily for confidence, with others mixed in which require more hard work. Some schools follow a more phonetic approach, using texts that mainly have words that can be sounded out, sending those books home once the child knows the relevant sounds.
It makes it difficult to compare between schools, as different approaches will see Y1 children doing a lot of different things. HTH