I have a special interest in improving memory and cognition. Ginkgo has numerous benefits for memory, cognition, circulation, antioxidant capacity, regulation of neurotransmitters. I often combine Ginkgo with Brahmi, Schisandra, Choline, and B Vitamins. Choline is very useful for regulating stress and neurotransmitters (especially acetylcholine). If stress is impacting memory and focus, I add Ashwagandha, Lemon Balm, and Passionflower. If tiredness and fatigue are making it hard to focus, I consider Panx Ginseng or Siberian Ginseng, depending on the situation.
Reference: Diamond BJ et al. Ginkgo biloba extract: mechanisms and clinical indications. Arch Phys Med Rehabil. 2000 May; 81(5): 668-78.