well, I suppose the only useful tip is practice :)
but if a little imagination may help, perhaps I can say a little about 施 though。
Now i am sure you have noticed about these five words they have the same "left-portion" and the "upper-right portion" in the way they write as.
so take a look at what's left if we take those portions out.
you will see a 也。You may think of 也是，couple this 也 to a 是,which pronounces as SHI!
Then you might be able to remind yourself 施 is pronounced as SHI!
HAHA! :p anyway don't worry, practice more, then you'll be fine