Why do I seem to only remember Allah during tough times?

My major exam results are coming out tomorrow, and the reality of it all just hit me. I'm on my monthly cycle, and I regret not praying Tahajjud and Salat al-Hajat while I had the chance. Now, all I can do is make dua and engage in zikr. I'm genuinely worried I might fail one of the mandatory subjects I need to pass to get my certificate, and it feels so hopeless that I'm only turning to Him now. I've been trying to give up my bad habits, and I told myself that if I at least did average in that subject, I'd fast for five days straight. But I feel so ashamed and helpless that I only try to draw closer to Allah when I need something. I've struggled a lot with my salah, and there was a time when I didn't pray at all. At the beginning of this year, I managed to pray at least three times a day, but it just stopped, and now I feel so lost. It's embarrassing how I'm only seeking His help now. I've promised myself to do my best to work on my deen, but I don't know if my dua will be accepted, and I'm unsure how to make up for those missed prayers in such a short time. If it's not too much to ask, could you please remember me in your prayers and make dua that I pass my exam and that my journey to improving my deen isn't too difficult? May Allah bless you.