Tips to remember the pronunciation of these words: 旅，斿，施，旋，族?
Well, I suppose the only useful tip is practice :)
But if a little imagination may help, perhaps I can say a little about 施.
Now, I am sure you noticed these five words have the same &quot;left-portion&quot; and the &quot;upper-right portion&quot; in the way they are written.
So take a look at what's left over 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.