I am BSc Physics graduates 3 years ago . After graduation I went into a totally different field "Accounting". (allow me to skip the reason here) I am so regret now. My passion is still in science and I want to return to the world of physics and hope to be a researcher or any professions in physics one day. I am going to take a MSc in Physics and hope to get into Mphil and Phd later. But now my problem is....... My physics sense is gone, my mathematics sense is gone... the memories are so loose and rusty. I feel so sad that like I have betrayed my beloved one. I really really hope I could pick up my undergraduate knowledge once again to prepare for my MSc. but I don't know how to do and where to start would it be effective and efficient. Back into the old days, I can handle 3 digits * 3 digits arithmetic mentally, but now I can't even handle 2 digits + 2 digts smoothly but with that Accountant Calculator. Oooops.... Please advice me how to do. THANKS A LOT MY BROTHERS & SISTERS !!