Just want to say, it's just the matter of experience. If you keep doing it for like a year or more, you will difinitely be an expert. Good luck then. Anyway, if you feel upset or bore, better do other stuffs which are not related to Sciences. London is a very charming city. There are lot of places that you can visit. Taking a short holiday is also another good option. You will feel fresh and better after a short break. Good luck and take care....you can do it
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