Congratulations on your marriage and your bonus child. Study tips are great but I have found that counseling is a great first step. The counselor is trained in getting to the root of the issues and helping to decipher what will work and what is needed. Recently my adhd teen was struggling with her grades slipping and we found that one teacher was the catalyst. After 2 weeks of the switch, she is thriving in more than one area. Prayer will help.