Here are some definitions and exercises to help you review so, such, such a, and such an.  
We use so with adjectives. 
The new Disney movie is so good. 
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We use such a/an with adjectives +nouns. 
Use such a with singular nouns that
  start with a consonant. 
 
Use such an with singular nouns that
  start with a vowel. 
 
Use such with plural nouns. 
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Test yourself to see if you know when to use so, such, and such a/an.
Complete the sentences with so, such a, such an or such.
1. I love Shrek. It is
_____________________ good movie!
2. The animation is
_____________________ amazing!
3. She’s reading _____________________
exciting book.
4. We had _____________________
fantastic day at the beach!
5. She saw
_____________________ interesting things on her travels.
Click on this link to practice so, such, such a/an.
Click on this link to practice so, such, such a/an.