Your GCSE results are similar to mine when I left School. Schools have a unique ability to make anything slightly interesting, incredibly boring. Seriously don't get uptight about your GCSE results it's early days.
If you're dedicated and willing to spend time in education you will still get in University and eventually onto your dream vocation. It will take you an extra year or so in college longer but at least you'll be able to use this time to hone your talents.
One thing I will say though is don't dwell on your grammar knowledge too much just yet. Take some creative writing classes if you can aswell, these will really improve your writing skills.
Remember reviews need to be interesting and include relevant and correct information.