One folder that survives three years

Keep a single folder — digital, backed up, plus a physical one for originals — holding every document in both original and translated form, along with every receipt and reference number. Name the files so a stranger could sort them: institution, document, date.

You will need all of this again, and not only for admissions. Employers ask. Professional bodies ask. Further study asks. Each time, the alternative is repeating the whole queue from the beginning. The half hour of filing now is genuinely the cheapest half hour in the process.