How long does it take you to learn backwards crossovers, backwards stroking, t-stop, lunge, and shoot the duck?

I would be staring ISI Beta very soon, and is wondering how long would it take to learn all of these elements required to p. My friend, Angela said that it's hard to learn in 7 weeks. She failed Beta once, but then the next session when she was in Beta again, she skipped it so now she's in Gamma. So is it really that hard? I take cles once a week for 30 minutes. And after that I take a 30 minute break, then skate for about 1 1/2-2 hours every week. For backwards crossovers, I'm slowly learning, pretty good so far, but not left over right. Backwards stroking is so-so, t-stop I can only do on my left leg, not the right, lunge is left only, and shoot the duck I'm scared to. Any tips for ping ISI Beta and how long it took you to p/ and learn these elements. Thanks. I believe I start on January 9th. Thanks~