GCSE (14-16 year olds) history is (supposed to) teach the various types of source (primary, secondary, etc.), and consideration of reliability, bias, etc.
For the sciences, we were required to use reasonable sources (perhaps not direct papers and journals, but certainly reasonably reputable outlets that discuss their findings.
At college level (16-19), I honestly don't remember this being a requirement (although I did drop history). Tests and assignments were mostly based on class teaching.
At university level, it goes full force after the first year. Everything you assert, you have to back up, using the university's preferred referencing system.