Hey Ranjit, after completing your 10+2 in science stream you have countless opportunities ahead.

regardless of Maths or Bilology side you choose.

some of the most common lines are

IIT JEE

NEET

going for graduation (b.sc)

or choosing some professional course like photography, hotel management, etc is quite an option too to choose after your 12 class.

yet it is always adviced to choose something which suits your area of interest.

Hi,

Hope you are doing well.

There are many courses which you can do after 12th science, Like:-

BE/B.Tech- Bachelor of Technology

B.Arch- Bachelor of Architecture

BCA- Bachelor of Computer Applications

B.Sc.- Information Technology

B.Sc- Nursing

BPharma- Bachelor of Pharmacy

B.Sc- Interior Design

BDS- Bachelor of Dental Surgery

Animation, Graphics and Multimedia

B.Sc. – Nutrition & Dietetics

BPT- Bachelor of Physiotherapy

B.Sc- Applied Geology

B.sc- math/physics/chemistry

BBA- Bachelor of Business Administration

BMS- Bachelor of Management Science

BFA- Bachelor of Fine Arts

BEM- Bachelor of Event Management

Integrated Law Course- BA + LL.B

BJMC- Bachelor of Journalism and Mass Communication

BFD- Bachelor of Fashion Designing

BSW- Bachelor of Social Work

BBS- Bachelor of Business Studies

BTTM- Bachelor of Travel and Tourism Management

Aviation Courses

B.Sc- Interior Design

B.Sc.- Hospitality and Hotel Administration

Bachelor of Design (B. Design)

Bachelor of Performing Arts

Not enough, there are many more short-term courses other than this.

Choose your career wisely.

Hope this help.

Good Luck!