yes... but there are a lot of differences between 1.5 and 1.4? because I would like to take the 1.5 exam. Do you think it will be fine for me, if I study with my 1st edition book?
Yes it will be fine if you study with 1st edition book only the thing is you should know objectives for 1.5 and learn according to that.
But I want to know that why are you using 1st edition if you want to take 1.5 exam?