Hi I got 87/100 on my last theory mock and 91/100 in one of my year 10 exams. I would say download the specification and just answer all the questions, DT theory is mostly common sense for topic 1 and 2 so I would recommend focusing on the hardest topics first and making notes then blurting the process. There are also high mark questions for the drawing questions so I would also watch videos on how to draw in isometric, one point perspective etc and finally there are also really good flashcards on Quizlet which cover everything you need for theory. I’m also going to watch a video the night before which covers all the spec points just to reinforce everything. I hope this helps and best of luck!!!