I'm always cramming to hand in an assignment or take an exam what can i do better?

Make a study schedule! organize all your notes and materials .flashcards work or find a study buddy who needs someone to push them to focus on the task as well.
NOTE- I have not used every thing on this list but I added them so you can see what works for you :) happy studying
 
 for homework help include khan academy, lit charts, brain(duh), Wikipedia- note I wouldn't use wiki as help writing an essay or something it's not considered a reliable source for things like that. wolfram alpha.

 to help with bookmarks and citations 
Instapaper, pocket, easybib also if you need a grammar checker for things you have to type you can download Grammarly to your desktop I'm using it now and it's so helpful.
 
 to help with note taking
notability, Evernotes, my script nobo, penultimate, supernotes, pages, office lens.

 to help with organization istudiez
,todoist,any.do,wunderlist,treilo, my homework

 to help with productivity

audimemo, lastpass, dragon diction,freedom,pomodroido

for flashcards, i really recommend quizlet or study blue.

for math calculators use math  way it's so helpful and one of the best calculators I've ever used.
note- if you have a school iPad or something this list can help a lot.

phew finally let me post :D
hope I helped - beanz

Attend and participate in fall prevention training. just took quiz.