Haboo
We can't advise you whether you should challenge the Decision, only you can decide this.
Things to consider;
Although you think you should have scored higher can you reasonably show this? For example could you use aids for Preparing Food, Washing and Dressing?
You need to consider the risk to your current award, we don't see it very often but the points you scored can be reduced and an award removed if you challenge the current Decision. In general, the more points you scored the lower the risk this also goes against getting a higher award.
Lastly revision rates at appeal are very low and you need to be prepared to go on to appeal if necessary, this could easily take none months or more.
If you want to go ahead the the first stage to challenging a Decision is for you to request a Mandatory Reconsideration, this needs to be done in writing to the DWP, within one month of the Decision, to the office that dealt with your claim, have a look at our PIP MR & Appeal guide for details of the process, the PIP area also has template letters that you can use to make the request with.
www.benefitsandwork.co.uk/help-for-claimants/pip
You should contact the DWP for a copy of the assessment report if you have not already done so, I would phone them but again follow up the request in writing. Once you have the assessment report you will have a better understanding of how the DWP Decision Maker has come to their conclusions and will then be able to argue against them.
Your primary task is to show that you meet the criteria, there are many reasons you may have failed, you need to address each of these but don't get bogged down in criticising the assessment report unless you can clearly show that it is incorrect, it is a lot easier to argue the facts of the situation;
"the assessor recorded that I walked 50m, I did but they have failed to document that I had to stop every 10m for a rest due to breathlessness"
than their opinions
"based on my observations of the claimant walking I believe that they can reliably walk more than 200m.
When you have a better idea of the issues with your claim, come back to the forum and we will do our best to help.
Gordon