Here are the previous WJEC Engineering Exam papers and mark schemes.
2015_past_paper.pdf
2015_mark_scheme.pdf
2016_past_paper.pdf
2016_mark_scheme.pdf
2017_past_paper.pdf
2017_mark_scheme.pdf
2018_past_paper.pdf
2018_mark_scheme.pdf
2019_past_paper.pdf
2019_mark_scheme.pdf