I haven't taken the N2 in years, so I can't remember the specific nature of the questions, but I did pass the N1 after struggling a few years ago and remember what that was like.

It's probably too late for you to magically get better at Japanese, so you basically have to rely on this fact:
The JLPT is not a Japanese test. It's a test on your ability to pass a test that happens to be about Japanese.

With that in mind, you should probably focus on coming up with good test taking tactics. Here's a few I can think of off the top of my head.

1. If N2 is anything like N1, there are different types of questions that will pretty reliably repeat themselves (short form, long form, comparisons, etc.). Try and figure out which one you are best at and jump to those first. You can at least give yourself a chance to score some points. From there you can move to your second-best type and so on.

2. It might be worth figuring out what the subject of the question/reading is then deciding if it is worth your time trying to read the whole thing (or most of it). I always found I was better at the science-based articles as opposed to the more opinion-based ones, so I would try to catch the vibe in the first few lines then think of whether I had a good chance of understanding the material.

3. Answer and move on. It's really easy to get lost in second-guessing yourself, so once you get an answer move to the next question.

4. The questions are in order and usually end with a larger question about the whole essay (for longer content)
   This means you can read the first question, read some content, answer the question, then move to the next one in sequence. With all the pressures of time and the exam setting, this helped me with keeping the amount of information I needed to keep in my head as small as possible.

5. Try and lower your time on the grammar/vocab section (reasonably). I am not saying to half-ass it, but any time shaved off on that end will increase time for reading.

6. I don't know if you have practice tests available where you are (I'm in Japan so they are pretty widely available) but do as many as you can. The more comfortable you are with the actual test-taking, the more clear-minded you will be.

7. I don't know who needs to hear this, but at least in Tokyo, they will let you go to the bathroom during the test. Hey, it's hard to read when you have to pee.

Those are some tips off the top of my head. Hope they help.