Triple v combined Science gcse for engineeringWatch
If you think you will mainly study the sciences for your A Levels then it could help you in terms of progression into you future studies in Yr 12/13. As long as your GCSEs include reasonable grades in Science, be it triple or not then you should get by okay
My application to an Engineering degree ultimately hinged on the grade I scored in A Level Physics - my other A Levels were fine. I am told it is quite rare that University admissions officers decide to accept/reject an application based on GCSEs. (Although I am unable to speak for the highest Universities such as Oxbridge).