just take your time doing your further exams. you have more than enough time to answer each question slowly and to do it to the best of your ability.
my exam flaw techique last year during my further exam was rushing through the questions. i skim through the question without reading the question thoroughly. Like in the Further Exam 1 MC 3, it asked for the "maximum range of the temperature." But since i skimmed through that question, i just read it as "maximum temperature." So I lost a mark on the MC exam. I lost other marks too in other section, but my grade was a low A+. I manage 2 low A+s on my further exam and achieved a 42 study score. I was hoping for higher, but I got what I deserved.
So if you manage 38+ out of 40 for Exam 1 and 55+ for exam 2, I'm sure you'll get 45+ study score. But make sure you show some decent working out and READ THE QUESTION SLOWLY!!! lol.