Well I am on this course and I am pretty sure (not 100%) resits are not capped at 40%. I have had to redo a lab report and that wasn't capped at 40. Of course, it could be different for exams, but it does not mention resit exams being capped at 40 anywhere in the handbook.
But tbh, in your first year, your actual grades don't really metter that much. They don't go towards your degree, you just need to get more than 40% on all your modules to pass into the 2nd year. Sometimes you can get compensation credits too. It's probably best to ring the undergraduate office and ask them about it.