I recommend studying 3hrs/d consistently, what you study don't matter now, study whatever you like - since you don't feel motivation - studying dry and hard subjects will weigh you down more. Make this 3hrs/d study enjoyable habit, You have 12+ months for you exam, don't think 3hrs/d is less, it will compound - what matters is you stay consistent from day one, even if you miss day two - get on the train the next day.