Well, it seems that you are very much interested in joining the Indian Army but are concerned about your 10th grade percentage. and falling short of the 45% requirement So there are some alternative options. The territorial army has slightly different eligibility criteria. You might want to check it out. Also, there are some other Paramilitary forces like the BSF CRPF which have their own recruitment process.If you have completed or 12th with chemistry and mathematics, you can explore the technical entry scheme which allows you to join the Indian army as an officer after completing your engineering. The recently introduced Agneepath scheme also has a different eligibility criteria, which is worth checking. INDIAN ARMY

These are indian army post and Eligibility criteria for 10 th pass students

Agniveer GD (WMP)

Applicants must be between 17.5–21 years old and have passed the 10th grade with at least 45% marks and 33% in each subject.

Agniveer Tradesmen

Applicants must be between 17.5–21 years old and have passed the 8th or 10th grade with at least 45% marks and 33% in each subject.

you can get admission in an open school like NIOS (National Institute of Open Schooling) to complete your 10th standard and be eligible to join the Indian Army, as the army accepts certificates from recognized open schooling boards like NIOS if you are not eligible due to less percentage in 10th class.

NIOS ADMISSION