What is hard to learn Grammar or mathematics?why?

What is hard to learn Grammar? why?

One of the biggest reasons that learning and using grammar correctly is so difficult is that there are so many exceptions to every rule. Pay attention to different collocations and especially to phrasal verbs and verbs with prepositions, because those are typically the hardest to remember.

Explanation:

What is hard to learn mathematics?why?

Math seems difficult because it takes time and energy. Many people don't experience sufficient time to "get" math lessons, and they fall behind as the teacher moves on. Many move on to study more complex concepts with a shaky foundation. We often end up with a weak structure that is doomed to collapse at some point.

1.the hosts on two opposing mountains stood,  

2.thick as the foliage of the waving wood;  

3.between them an extensive valley lay,  

4.o'er which the gleaming armour pour'd the day,  

5.when from the camp of the philistine foes,

6. dreadful to view, a mighty warrior rose; in the dire deeds of bleeding battle skill'd,

and your question what topic are you in trouble with?