first of all, i think u don't need to worry too much at this stage. most cases won't be confirmed until around the age of 3.
as there will be another assessment in 2 months' time, don't give yourself too much pressure but in the meantime, u may wish to read more. e.g. from 特殊教育 in BK or http://www.hkedcity.net/specialed/autism/
re. 重覆又重覆做相同的事, u may wish to know that all kids love 重覆又重覆做相同的事 as it's the major way to acquite a knowledge/skill. but those kids w/ autism usually 會堅持某些行事方式和程序(e.g. my friend's kid who is recently confirmed to be autism insists putting the puzzle pieces from the top-left hand corner. he will be v. angry if u help me play the other way)