SATs tests are supposed to be used as assessment tools, to support the teacher's assessments of the children. As such, they should not be regarded as 'important tests', and certainly don't need to be practised.
SATs have been used like this (as support for teachers' assessments) for about 7 or 8 years. Teacher assessment levels are reported at the end of the year, not test results.
These are quotes from the KS1 Reporting and Assessment 2013 booklet, which all Y2 teachers are obliged to read and follow:
'If teacher assessment and task and test results differ, the teacher assessment results should
be reported, provided the judgement is based on an appropriate range of evidence from
work completed in class.'
And even MORE importantly:
'Teachers can use the tasks and tests to inform their assessment judgements at any time
during the year, but children are not to be tested more than once during the year in each
subject or attainment target.'
I'd be getting myself up that school as fast as a rat up a drain-pipe! It's totally unnecessary to stress-out these little children like we used to in the past.
The whole booklet can be downloaded - just google 'KS1 reporting and assessment arrangements 2013'.
At my school, we have already done the SATs tests to use as our mid-year assessment and to help identify weak areas.