Have you given serious thought to why you teachers keep setting you targets in all your subjects? There are many reasons why you are set these targets? In fact in addition, you must also think of your goals in Maths.
There is a difference between targets and goals and it is important you understand the difference between the two. Targets are more short term whilst goals are long term. In order to achieve your goals you need to set targets that will lead you to your goals.
For instance you may aspire to be an engineer in say, 10 years time. That is your goal. However to achieve this goal you need to achieve a Grade A in GCSE Maths and a Grade B in Advanced level Maths. These will be your targets. Your targets are the milestones in your journey to achieving your goal of becoming an engineer. Without these targets you will not be able to gauge your progress and know whether you are on the right track to achieving your goal of becoming an engineer.
Targets also play a motivational role in your effort to achieve your goal. Targets give you a sense of achievement from one level to the other and will spur you on towards your goal. Targets will help you overcome frustrating and difficult moments in your life and help you focus on your goal.
On a piece of plain paper write down your targets for all your subjects and refer to it as often as you can. Picture yourself achieving these targets and how it will make you feel once you have achieved them. Write your goals down on the same piece of paper. Add pictures and diagrams and use colours to make it attractive. Keep this piece of paper some where you can look at it as much as possible. I suggest the wall by your bed or by the mirror you look into every morning. Reflect on your target and your progress and keep reminding yourself that you will achieve the targets you have set yourself.
Best of luck.