Unlike Inflectional languages i.e English, or other European languages, the Chinese language is an analytic language. In other words, it depends on adverbs, auxiliary, or adverbials or the context to identify or distinguish the tenses, the numbers. Luckily most Chinese words are without genders like modern English.
Congratulations if you've really grasped a number of Chinese characters which seem to me are the most difficult for non-native speakers, and the next thing is the tones. Each character would be a drawing. As to grammar, personally I don't think it is that important, unless your goal is to be a linguist of Chinese.
Probably you can buy a good or so-so Chinese grammar book instead of going to so-called standard Chinese grammar course.
My two cents.