I can't concentrate in class :(

Don't worry -- I have students at university who have the same problem, and they are definitely not diabetic. You are growing and changing physically, intellectually and emotionally -- you will just develop different ways of working and concentrating, and increasingly your studies will allow you to focus more on the things that interest you anyway.

Years back I went to a meeting at my sons' school. The problem of boys (it was a single sex school) losing focus was discussed. It's normal! We were told it's more likely to happen with intelligent boys and they piloted a 'fast track' scheme so that bright kids could do their GCSE's early in some subjects. The head teacher told us that it was a fact that some of the brightest boys who would have got an A * grade in year 10 often underperformed in year 11 and only achieved a C grade. Lessons were made more interesting too and didn't just teach what was needed to pass the exams.

So what I'm saying is you're normal, everyone goes through this, you just need to find a way of learning and revising that works for you. It's tough, but you're bright so you will get through it fine

I know that feeling well. I look at it this way... if i can concentrate for a minimum of 5 minutes, and that is forcing myself sometimes, on one issue or subject and i actually learn something then its a result, i know something i didn't five minutes ago and then i feel less guilty about it.

Did you try checking your BG during those moments when you can't focus?

Well you're 16. Its likely not the Diabetes lol So my only advice is to get excited about more things. Find a way to make everything exciting and you will learn much much more.

Research has proven that memories can be linked to emotions, and people have the most vivid/best memories when they are emotionally invested in something - like when they get excited about things. Think back to things you remember, they are probably all very happy situations, or very depressing ones, and the normal everyday stuff gets lost.

I find that i can remember pretty much everything IF i get excited about what i am doing, even pretending to be excited and stoked will help me remember things. Obviously if you are in class and falling asleep, or staring at the board blankly you wont remember things!

So, my advice - Get MORE involved - ask questions, make jokes about stuff, discuss things with others, read and read on the topics and get excited about SOME part of it. I always gravitated towards the weird details most people glossed over, but it helped me get excited because i was the only person who know that little (useless) 'fact', but while learning and remembering that fact i remembered the rest of material as well lol

Its likely NOT your T1D, but if it is, if you are high or low, getting involved and excited can help anyway.

This is the age where you have to force yourself to be awesome.