what cha cha cha said is true. however, some courses require that you obtain a number of module marks in the degree class you are awarded. there are also some rules for borderline cases these are:
exit momentum - if you final year marks are higher than previous years then can be awarded the higher classification
not sure what the second rule is called as it is a latin one - if your mark is pulled down by one or two bad marks then they may be recalculated with out these marks and you then may be awarded the higher classification.
This systems is only employed in the case that someone is short of a classification by a small amount ie 1 - 1.5% max (49.9%, 59.2%, 69.5% etc). These rule are also not used to drop marks down. you can only go up classifications with this system.
Universities also have systems for failure of modules some allow you to fail a single module and others allow marks down to 30% as long as the average is 40+. if a university uses the somester system they allow students to take extra modules in the second somester to make up for failures in the first somester.
finally, football i guess u have not been to university and there is little chance of u getting into one, other than to steal computers or mug students. Get over it!