yes you can get A* without doing fp2 but not with 5 modules. Assuming u had done s1 and m1 for the first a level, u can take 6 module from m2, m3, m4, m5, s2 ,s3 ,s4 ,D1, D2, and fp1. I had a friend who got A* in further maths and he did d1, d2,fp1,s2,,m2, m3 for further maths achieving 96% average.