Sounds like your daughter requires a tutor who is proficient at
both A level Chemistry and A level Biology,
and it has to be a tutor willing to give 1-on-1
tuition. This is difficult to find for both reasons : at A levels,
almost all tutors (at least the good/great ones) specialize in one
subject (ie. Chemistry, or Biology, but not both). And almost all
tutors (at least the good/great ones), only give group tuition
these days, because group tuition is more efficient and worthwhile,
for both the tutor and the student (since 1-on-1 tuition will be
very expensive for the student, to compensate the tutor for loss of
earnings relative to group tuition). Sorry if I’m not directly
helping you with your query, but I felt that you should know the
truth of the situation.