I agree with everything Lee put down, and I just wanted to add this. I teach english in Austria and I always come across this problem! The german word "lernen" sounds similar to learn, but it is used differently. My students will say that they have to learn for a test, and this sounds wrong to me. The activity that involves going over notes to prepare for a test or quiz is studying. "I have to study for the test on Friday" or "I haven't studied at all this semester."

It is basically saying "I think he is attractive" saying my three times is a way of saying you are surprised and impressed by something. A similar phrase is well, well, well. Fine is an synonym for attractive, but it isn't used very muh.

If you get scared, it might make your heart beat really fast, so you might feel more awake. "A good scare" is basically the same meaning as "getting scared." So t is just saying that getting scared wakes you up quickly.

I feel like both could be ok. An opinion of someone would be of their general personality. An opinion about somebody could be about some specific part of their personality like "they chew too loud"

it means that it is really bad. Sucks can mean that something is bad (as well as blows...). "This movie sucks" "This food sucks" both mean that those things are bad. "In a big way" just means a lot. So something "sucks in a big way" is the same as something "sucks a lot."

"I'm helping him understand" might sound good if you write what it is afterward. Like "I'm helping him understand how to do this math problem." Without the context it sounds a little off. "I'm trying to make him understand" sound like you are very frustrated. I could imagine someone in a failing relationship saying something like this. "I'm trying to make him understand my point of view, but I just can't." Making someone do something usually sounds quite forceful. A similar meaning might be "I'm trying to get him to understand..." which sounds more like you will guide this person along trying to understand. I don't really understand the sentence "I'm forcing him and making him understand." Maybe it sounds like you are frustrated trying to help a lazy friend study for a test. You try to study with the friend, but he doesn't want to. Somebody asks "What are you going to do?" you could say "I'm going to force him to sit down, and I'm going to make him understand!" Basically you should write what you mean, instead of leaving information out. Forcing him to do what? Making him understand what? Then it should be good!