That is almost impossible for someone else to advise! It depends entirely on how easy the assessment centre is to reach and how you are able to travel.
One thing you should be aware of is that you will be asked how you got the the assessment centre. This is not a social question, it is part of the assesment! Likewise, you should expect to be watched as you enter and leave the centre, and at all times in between.
Nothing on this board constitutes legal advice - always consult a professional about specific problems
As MHB says, they will take into account how you travel to and from the Assessment Centre, they will also make observations whilst you are in the Assessment Centre, and make assumptions.