I don't know what happened to me

For the past 2 days i been having physics lessons in school.I have been taught Current Electricity right now.So far in physics i have been taught Light and Waves , Current Electricity , Measurement , Kinematics , Mass-Weight-Density , Turning Effects of Forces , Energy,Work and Power , Transfer of Thermal Energy , Thermal Properties of Matter.I have conquered all the topics listed except Current Electricity.I had some problems solving its problems until this morning 11+.I finally see the light in this topic.
Also these few weeks i seem to have lost confidence in doing maths.When I am doing my maths homework i always have doubts in my answers.Is somebody holy testing my self-esteem?I really don't know but i believe so.I think i have just lost faith in everything i have done.