A Level Choices Help

So I get my GCSE results on August 25th, and on that day I will also be asked to choose my 4 subjects to take on next year. I am definitely doing Biology and Chemistry at A Level, and deciding between Applied ICT and my fourth subject as which to drop at AS (whichever I get the worse grade in come the end of the year)

I would like to do Medicine at university so Biology and Chemistry are my main two focus points, however I can not decide between History or Technology and Design for my fourth subject. Come the end of the year I would like to focus mainly on my Biology and Chemistry exams seeing as they will be the most important, and choosing technology will allow me to do this as a certain percentage of the A Level will already have been completed due to coursework, whereas with History it is determined solely on the exam papers.

However, the technology department at my school tends to put all of their time into getting a good grade in the coursework, and is poor at teaching the exam theory (normally just printing out a booklet and skimming through it in class) which I do not find very beneficial. On the other hand, the History teacher is very good and will explain in a lot of detail the material and how to present it come to the exam. Another thing is that with my exam board (CCEA) there are very few/no revision guides nor a lot of revision material when it comes to these two subjects at anything above GCSE, which I heavily depended on during my GCSEs and would hope to do at A Level, but because of this I will be depending a lot on the teacher.

Could anyone give me some insight as to what I should do? The closer it gets to results day the more worried I become that I may make the wrong choice and end up messing up come to exam time next year.