Reddit reviews Error Analysis of 900 Sample Sentences (Intermediate Level) (English and Chinese Edition)

Most apps are geared towards beginners and early/mid intermediate learners. The Chairman's Bao and Du Chinese offer HSK6 reading material, but whether HSK6 is "advanced" is a matter of personal opinion (IMO it's not).

In addition to learning through native materials (books, TV shows, etc.) your best grammar resources are going to be books, in addition to AllSet Learning's grammar wiki:

• [Allset Learning Grammar Wiki] (https://resources.allsetlearning.com/chinese/grammar/Main_Page)
  
• Modern Mandarin Chinese Grammar: A Practical Guide
  
• Basic Patterns of Chinese Grammar
  
• Schuam's Outlines of Chinese Grammar
  
  Appropriate for Intermediate or Advanced Learners
  
  
• Common Chinese Patterns 330
  
• A Guide to Proper Usage of Spoken Chinese
  
• Error Analysis of 900 Sample Sentences
  
• A Learn's Handbook of Modern Chinese Written Expressions

There is a whole book dedicated to this:
https://www.amazon.com/Analysis-Sentences-Intermediate-English-Chinese/dp/7800525155

http://www.amazon.com/Error-Analysis-Sample-Sentences-Intermediate/dp/7800525155

http://www.amazon.com/Common-Chinese-Patterns-330-Chen/dp/7802006473/ref=pd_sim_14_1?ie=UTF8&dpID=5130hfQkQKL&dpSrc=sims&preST=_AC_UL320_SR228%2C320_&refRID=0QCRDAWC7V3TZXMSCC25