There are no easy routes to perfect spelling in English. However, your spelling skills will improve if you:

1. Write carefully and use a dictionary.
2. Repeat the proper pronunciation of the word in your head.
3. Visualize the syllable divisions:

   ac quaint ed 
   dis appoint 
   mis spelled 
   val u a ble

4. Identify what part of speech the word belongs to:

principle [noun] 
principal [adjective]