Hello,

One year is more than when it comes to preparing for SBI exam, firstly you need to inculcate a strong mindset to motivate yourself on a daily basis, it's quite easy when it comes to improving English start off with Wren and Martin grammar book, learn all the fundamentals, and apply it with the help of mock papers freely available in competitive exam sites, you can use word power made easy for building vocabulary, other than this read newspaper on a daily basis especially the editorial parts which you will improve your comprehension as well, this will also cover the dynamic portion of GA, so make a habit of daily newspaper reading, and  also read The Economist/The Business Standard to cover the business, economics portions that's part of GA being a banking exam. you just need to motivate yourself, everybody goes through their share of ups and downs in life, you are not an exception, but the real spirit lies in fighting back and this is something you  have to do on your own, we can guide you but eventually it's up to you to take the initial step and be consistent all along the journey.