Suddenly afraid of the ratio between age and maturity

I just rose from a 7-hour routine of studying and doing other stuff. Its our Chemistry Laboratory finals tomorrow and the stakes are high: this subject is almost the only one where I can get a pretty grade from.

I have never developed a study habit or method that raises my confidence in taking an exam. Its just in college where I realized how bad I want to be a public physician and now I'm scrambling for the years of practice I lost into browsing the internet and gathering information so amusing they are of theoretically no use. 

Its almost everyday I have a sudden blow of vague realization which is often followed by a strong calling to assume the fetal position. Hands around folded legs, trying to be as small as possible and the mind emptying of all the worries learned.

I'm just trying to distract myself with earthly endeavors. Life will never be understood.