Protein !!

I have also struggled with getting enough protein, but I eat mostly vegan. I found these Raw Rev Glow bars on amazon! I eat one of the creamy peanut butter sea salt ones every day now with breakfast! 180 calories and 15 grams protein, 13 grams fiber I think and only 3 grams of sugar. All real ingredients, no sugar alcohols which do not agree with me... anyway, these bars have been a lifesaver for me. I try to eat healthy and get some protein with every meal or snack but this is a great boost to my diet.

For me, planning is key. The night before, I take a few seconds to chill and just pre-log everything for the next day, modifying and changing things until I hit the numbers and ratios I want.
My main foods are - like everyone else - eggs, minced beef (drain the fat if you wish), cheese, protein powder, tinned tuna, chicken and the odd protein bar as a treat. Doing this I usually hit 125g - 150g with a 1500 calorie limit.
And if you're not a broke student like me, there's salmon, Greek yoghurt (high or low fat), and seafood.