Sad news but i have been in your position before - it took me 4 attempts to get the results i needed but i finally got there in July. Yes you do need it for skills assessment. What revision have you done? I found youtube - learn with emma - (engvid) very useful. It was my reading that just let me down! So frustrating. Just keep practice, practice, practice… you will get there. The ilets website has practice papers too, i printed them off and kept going over them.
Lisa