How to study without procrastinating?

3 months almost sounds like too long beforehand. Are you studying for maths that you have in school? Then I would say start about a month beforehand OR what you could do now ( I had to do it before my year end exams - third year university now)

1. Break down the topics that you have to study for maths (do this on an excell spreadsheet - makes it a lot easier) - remember to break the maths down into the main topics)
2. Give yourself a rating (1-10 about how well you know the work - I.e. 3 if you are bad with it, 8 if you are excellent with it)
3. Determine how many time you’ll need for each topic. I.e. an hour for topic one because you know it well, two hours for topic 2 because you are not as good with it.
4. Start with the topics that you are the worst at and make sure that you understand them and do one topic a day if possible - for bigger topics take two days.

I found that breaking up the work and actually getting structured about it, made it a lot easier for me to sit down and study.

Good luck!!!