You can go into many fields as the advantage of having maths as main subject in class 12th is that you have many carrer options after class 12th. You can do BCA, BBA, BSC in any subject of your choice, you can also go for commerce subjects like bcom hons, bcom, BA after that you can persu your post graduation from any field or you can also go for MBA or Civil Services. All you need is to identify your interests in the subjects and career options as do as directed by your mind and heart.

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You can preparation of BSC, there us online difference in BSC and BTECH is in BTECh we study in practical way and in bSC we study in theoretical way. And after graduation you can appear in UPSC exam and also apply in SSB at present you can give exams of SSB for entering In Indian Air Force, navy etc