Is there a STEPS assessment report that can be run for the whole school, by class with the children's names that only shows one checkpoint of data.

You can run such a report at Reporting > Assessment > Checkpoints Multi-Subject.

If you run this report by all year groups, select the subjects you wish to see data for and the checkpoint you wish to view, then Choose.

Once run, to filter the report in order of year and form click onto the column heading 'Year' anywhere apart from the bin and then hold down the shift key and do the same for the column heading 'Class'. This way you will get all the students in alphabetical order within classes and year groups, and assessment data for each selected subject at a particular checkpoint.