G-MIDY
Of course work hard and get as many qualifications as you can with good results........But at the end of the day all the degrees in the world doesn't mean you will pass the ATPL's.
I studied with some really intelligent guys with degrees comming out of every orrifice but struggled with both the ground school and the flying. At the same time some real duffers had no problems.
The thing that will get you through is a positive attitude with being the right chap!
There is nothing really difficult with the ground school other than the quantity of work to study and this is especially true of type ratings.
Having good grades will certainly help with a cadetship.
So my two penny worth is study hard, get good results (seems you are already) and be aware that the amount of info thrown at you at Atpl level may well be humbling.....as happened to me!
Good luck in this mad but rewarding career