Difficulties in academic writing

In our college study, we have to write a lot of academci essays. Academic essay is quite different from general papers. When we write an academic essay, we have to pay attention to many aspects, such as the format, organization, language, and content. For me, the most challenging part of writing an academic essay is language and content.
I take the module SSA2204, which requires us to have a good skill of writing academic essay. however, for me, i have lots of problems. Content is the most big problem. When i read the singaporean students' essays, i find their content is very meaningful and closely related to the topic, however, my essay lacks of such meaningful content, which cannot prove my opinion very well. hence i plan to read more local studnts' artilces to improve my lackage of content, and in daily life i had better to read more newspapers and academic journey to enrich my brian. Another problem for me is language, my tutor told me she know what i want to express, but the language is not so good, for example, my language either has some grammar errors or is very simple. I always feel very worried about my language because i find i hardly have some improvements on my language since my briding course. My previous tutor told me one way to improve my language is to memorise a lot of vocabularies, hence you can choose a better world to put in your sentence to make the sentence more meaingful. For the grammar errors, sometimes i find it's a little different between China and Singapore, for example, in my briding course i wrote a sentence " the more you eat, the heavier you are", my tutor told me this sentence is wrong, but my chinese-english teacher taught us like that. so i think i should read more or recite more sentences to modify my errors.