For entrance in btech college u can give JEE mains

In February

JEE advance

Third week of may

BITSAT

Third and fourth week of may

VITEEE

Second and third week of April

SRMJEEE

Third and fourth week of April

COMEDK

The second week of May

KIITEE

Secod and third week of April

WBJEE

Third week of April

MHTCET First and the second week of May

After pursuing your btech you can give

UPSC Civil Services exam,

ISRO/BARC,

GATE,

NDA exam,

and SSC JE