'Subjective' should be 'subjunctive', I would think.
I'm not familiar with what they are teaching in your college, but I think the textbooks you have will be representative of the material you'll need to know.
You need to be very familiar with all sorts of pronouns.
You need to be very familiar with noun-adjective and subject-verb agreement.
I think you should know how to conjugate verbs in all the indicative tenses, and have a good idea about the subjunctive conjugations.
You should know how to conjugate verbs in the conditional and imperative moods.
Learning when to use the subjunctive is very important. We don't use it very much in American English, but it is very prevalent in Spanish.
The irregular verbs will take you the most time to master.
The pronouns turn out to be a large stumbling block for most students.
You have the advantage of asking questions here.