Indeed, if you really can't afford to buy a decent current study pack that you know will be up to date for the latest exams, then how on earth are you going to afford an extra few hours if you need them at the end of the course.
For that matter, once you've got the licence how are you going to be able to afford to stay current and safe.
If you're that strapped for cash then wait until you can comfortably afford to start, don't waste money on outdated study material. A lot has changed in the last 10 years, not just the law, but the exams have changed entirely with a different style of question being asked.
Flying isn't cheap, but at the same time you get what you pay for, and trying to cut corners doesn't usually end well.