You should choose a few spellings on daily basis. It can be 5-10 nos. according to your capacity and your target. The quantity of vocab should be quality wise not quantity wise. Then you should prepare a sentence with that perticular word. Each word should be remember with a sentence. That sentence will help definitely help you to remember the vocab. And the most important thing which is revision. Revision should be made necessarily. Without revision you can't store maximum vocab in your mind.