I agree with Sally-Anne and will try not to repeat what she says.
It is a fact that in most if not all areas, pupils receive a greater and greater amount of coaching, and consequently all children need a reasonable amount of preparation.
For this, you can either get a tutor or DIY.
The advantage of a good
tutor is that they have the experience and the knowledge of the exact exam format.
The disadvantage is obviously the cost, but also the risk you take when you chose a tutor.
(see here for some bad tutor experiences
There is lot of information on this forum now, and a lot of support on how to tackle the preparation for specific exam formats, but as the Wolverhampton forum is not the most active so you may have to find out some the information from other sources like the schools and any parents that are willing to give information. The more information the better.
It is important that you not only find out about the exam subjects but also their format (The exam board, NFER or else, and multichoice or standard format).
Once you know what you need to prepare for, we can help you with how to do it.
In the mean time, ask any question that you wish as many people are very happy to help. You may want to also post in the Wolverhampton section