the sentence you want to know means no matter how you hard you learn you still cant understand. no,we dont use 学得会 usually,you can use 学会了,学好了,and搞明白了 and so on. hoping my answer is useful to you.

“怎么也学不会”说明你采用任何你所拥有的方式都不能达到你所需要的目标，而“学得会”是说明你有能力达到你所希望达到的目标。

怎么也学不会means that you tried but somehow you can't make it done ,especially when you are talking about learning to do something ;学得会means you can do it .

怎么也学不会 = No matter what (I do), (I'm) still unable to learn (it) 学得会 = able to learn (it)

这句话的意思就是说“无论用什么方法学习都学不会”。“怎么”在这里的意思就是说“不管怎么样”