I don't know what to do here.

I know exactly how you feel. When I was in Uni I felt as though if I failed my parents would kick me out of the house so there was a palpable amount of tension and stress whenever tests came about.

Before I would study I would always train physically. It is proven that there are enzymes the brain gives off that help with attention and memory. You cannot deplete yourself here though. The sweet spot is about 45 minutes for those accustomed to working out, and if your not then I would recommend getting in the routine. Maybe a light workout, or cardio, with yoga after. Trust me it works. The amount of stress I was under would have broken me if I did not spend over 2 hours in the gym when in college. It would have been absolutely impossible.

Please take it easy with yourself. It sounds like you're being overly hard on yourself.

Have you started meditating yet? It would be good to start with Awareness Meditations on the ToZ to start building awareness and concentration. It will make you conscious of your thoughts and you will realise that those suicidal and negative thoughts are NOT YOU. It's clutter to be cleared out of your mind, not who you are. In addition to that the increased capability to focus will help you with your studies.

In addition to that I recommend taking time and attention to deeply clean your chakras and aura, as instructed in the ToZ meditation section. These will clear the negativity and dross out of your soul.

Yellow colour "can be used for passing exams, improving the mind, for deeper concentration, mental power, learning ability", as stated in the page about The Magickal Properties of Color.

Try to meditate that will help you a lot brother.

I recommend yoga vey much, that's what helped me the most during the time I was very depressed. Specially if you are new, doing daily meditation like aura cleaning and Aop and chakra works is also very important but it takes time patience and consistency to build up a strong and clean aura, which helps in clearing away negative thoughts.

Though I was doing daily meditation before doesnt mean the depression went away immediately, it needs time and consistency to built up a good foundation, the negative thoughts we're still persistent but doing yoga was a great practice to immediately feel good and clear away negative thoughts. It makes me feel accomplished and productive. From time to time I'd suddenly feel down again and depressed, so I'll force myseld to move,do yoga, workout, jogging,dance, anything that makes my body move a lot, and it made realise the more I laze, sit and do nothing the more those negative energies will accumulate in me. Move your body it will also help relax your mind and make it easier to focus on meditation.

"The impediment to action advances action. What stands in the way becomes the way." - Marcus Aurelius

Negative things will continue to happen to you, just as they happen to me. It's not about escaping negativity, but accepting that we must manage it. I want you to try something: the next time something negative happens to you, laugh. Laugh at the situation, circumstance, or person. Be lighthearted when these things come around, as if they are a necessary catalyst for your character development. Expect life to give you what's bitter and sweet, and take both of them with modesty and temperance.

As for your exam, perhaps you're studying the wrong way. Change up how you study and try again. You can also use runes like Mannaz, Kenaz, and Ansuz for intelligence and memory. Mercury goes direct today and the moon moves into Sagittarius, making it a good opportunity to do a working for school.