I am in my first yearstudying fora maths degree and we are currently doing a module called financial markets. We are learning about shares and all. We have been told to build a portfolio of shares.
We go on to the stock websites and get to buy stocks. Completely free so you can invest as much as you can and buy whatever volume of stocks (our maximum £10000). You can get shares from any company. (FTSE 100 or 250 etc). You can also find the history of companies including their share prices, performance etc
If you want to experiment try these websites you may need to register freely on some:
www.moneyextra.com/stocks,
www.moneyam.com,
www.advfn.co.uk,
uk.finance.yahoo.com,
money.msn.co.uk, markets.ft.com/news/markets/uk, news.bbc.co.uk/hi/english/business.
Hope these have not come late.