If i want to do PHD in MATHS then which degree should do , i mean BSC. OR BSC. HONS??
I think you must go for B.Sc. Hons in Mathematics. After that you will have to pursue M.Sc. in Mathematics. IIT JAM, JNU EEE are some entrance exam for M.Sc. program in top Central University and IITs/NITs. You can also Join integrated Ph.D. programme in Mathematics after B.Sc.
After M.Sc. you have to attempt GATE for Ph.D. from top Institute.
Good Luck.