On the face of it, it doesn't sound like a particularly reliable source of income.But there again, it's always a start ... "a foot in the door", as it were. And, since care homes tend to have a fairly regular staffing turnover
... due to annual and sick leave [as well as other exigencies likely to crop up from time to time] it presents the ideal opportunity for gaining invaluable on-the-job experience which, in turn, would stand you in good stead when applying for any vacancies that - by the laws of average - are almost certain to arise sooner or later.
It's your choice, though, mate!