Choosing a levels help

Hello,

i wish to do a degree in Human, Social and Political Science/ Spanish with history and need help chosing A levels. One really wants to attend Cambridge/a top uni to study these degrees yet by studying at AS

Psychology
History
Spanish
Sociology

Will this mean that i won't get into these top unis. i was planning on doing history, spanish, rs and sociology or gov & pol yet neither fit into my option blocks for the sixth form i really want to go to. Help!!i do hope these unis would prefer A/A* in these subjects revelant to the courses than ones which have no use, plus what i do for extra curricular should help hopefully.