You are not qualified for any employment visa practically anywhere in the world. Even international internships typically require minimum of bachelor's degree, and increasingly often now, minimum master's degree. You have to do your "placement year" in your country of citizenship.
IF you are a citizen of an EU-member country, you might find a placement in another EU-member country, but you will need fluency in that country's language. A few countries have Working Holiday Visas (WHV) for citizens of certain eligible countries. E.g. Australia, NZ, Canada & UK have reciprocal visa agreements with each other. You must meet additional requirements besides citizen of eligible country, and you must have sufficient funds for your year of travel in the WHV country, but you are allowed to pick up short-term, seasonal or occasional labor jobs during your stay, IF you can find anything. You CANNOT work for a full year for one employer nor arrange employment in advance.
See your university's placement office, your advisor. Not knowing where you go to university & university regulations regarding such "work experience," it's hard to advise. But if UK citizen, you appear to be limited to UK jobs, and even WHV might not meet "work experience" requirements due to WHV regulations.