I think 1 year is an ample amount of time, and Its good that you want to improve your score.
I am not an expert to advise you any strategy, but I can try to share my 2 cents

. I am also just one of the student like you good at practical things more than theoretical.
For my first attempt I prepared for 8 months and I got V19 and Q45 (530). I spent lot of time in solving quants PS and DS on gmatclub, which is a best place to practice and learn concepts of quants, but only 20% of my overall preparation period I spent on verbal. A day before GMAT I appeared in GMAT prep and scored 27V Q48 (630), few questions of prep test I had solved before and I knew that I will definitely going to get less than 27V in real GMAT, and my prediction was right.
GMAT actually tests your cognitive endurance. I can bet you that every question of GMAT is solvable and anyone can reach to right answer if he or she gets plenty of time to play with that question, but GMAT is a timed test and that luxury it doesn't grant. Thus it is important not to surrender mentally to any question specially in quants, try to identify the cracks in the question and apply basic mathematical skills to break it down. Do not allow your mind to choose guess away with the answer build a fighter approach. GMATCLUB is a best place to build your quants concepts and definitely you can score 40+ in quants. BB has created question directories for verbal and quants section such as this one for PS :
gmat-ps-question-directory-by-topic-difficulty-127957.html , start solving question topic wise of 500 level question of 1 - 26 chapter, and move up to 600 and 700 difficulty level, learn from solutions posted under each question and build your concept, refer to GMAT CLUB math book as well. Link
gmat-math-book-87417.html and prepare your self to solve 2000 questions in problem solving section at least and it should take 3 months to complete and then switch to DS section afterwards. Definitely after PS you will find DS easy, but DS needs a different level of mental preparation and that comes by practice only. You can also refer class 6th to 10th Mathematics book to refresh your basic concepts even I have also spent some time, referring NCRT 6th - 11th math books to learn few concepts or clear my doubts. Make your basic concepts strong, and follow Bunnuel and Karishma on gmatclub.
For inequalities's basics refer these following links and gmatclub math book link shared above.
inequations-inequalities-part-154738.htmlinequations-inequalities-part-154664.html#p1238004Parallel you can daily put 30min in reading scholarly articles and specially novels, reading will improve your vocabulary, which will help you in CR and RC.
I would personally recommend you (6 month before your exam) to register for e-gmat verbal online course and start your preparation as per their instruction and guidance. I am also current e-gmat student, and somewhere I feel that I am regular with my verbal preparation bcz of this course, I am learning new concepts and new procedures to deal with CR questions, and it is better than self study. When I was preparing for verbal I lacked strategy to deal with different types of questions. I was simply solving OG and reading
MGMAT SC, but certainly that was not enough and I scored 19V.
You should think positive. I think you have nothing to loose, 320+ all bonus and start your preparation with a new strategy.
I hope this will help.