One of my friends told me that the school make the year 9 marks low so that the GSCE results look even better,surely this can't be true ?
Schools don't control the targets that way. There are expected levels for each child, dictated to the school by the Fischer Family Trust. Schools can
set higher targets; if they tried to lower them, Ofsted would soon be on their case! Low Y9 targets would not, in any case, have any effect on how the GCSE results look since they aren't published side-by-side.
That said, the FFT data doesn't apply to every subject, so schools generally make a 'best fit' judgement based on the predicted levels for the core subjects.
As others have said, MFL targets tend to be lower if they only started the language in secondary. A target level below 6 in ICT would concern me if all the other subjects are above 5. RE is compulsory; most schools therefore offer at least a half GCSE course - I don't know about the low target, but there's no reason for a child to do well in other subjects and badly in RE as the skills at each level are similar - e.g. more explanation/analysis in higher levels.