You should compare and select the best 6 from your 2 results.
English Novdec B3 Wassce C6 so your english grade is B3 which is the better results.
Repeat the process for core maths and either social or science.
Do the same for 3 other elective subjects to get your best 3 core and best 3 electives from the combine results.
Add the best six subjects to calculate your total aggregate.
To know which programs to apply for at any school, compare your aggregate to their programs and cut off points and select the once you qualify for.
Do that for all schools of your interest
Ask for help if you are confused.