My school is also doing 3-4 techniques a class, it's almost impossible to get enough knowledge about the basics and how to handle yourself in sparring.
Internet and your teamates are a great ressource to solve your problems.
My first reaction was, asking my ''submitter'' how to escape the sub he just did to me, within a month I had a huge database of escapes in my mind, I didn't manage to do them properly in the beginning but at least I was trying something logic to counter them.
When you start, the main problem is that you don't know what to do in when you're in a position.
So if you're always stuck under side control, you need to know how to get a good position and how to escape it, if you have 1 or 2 good escapes and you know how to put your arms and legs to not get into deeper trouble, you'll be working on something solid at least. Like I said, it won't work at first but you're gonna be working on something that will work someday.
You'll have to do the same thing under mount, halfguard and when someone takes your back
After that you will need to learn how to not get your guard passed easily, guard retention is the first step to stay out of trouble.
In my case the classes weren't covering those things fast enough so I learned them on the internet.
For the attacking part (sweeping, guard passing, submissions) I pretty much did the stuff we learned in class and it was more than enough for me.