Hi Sai,

See, when you won't get your dream branch by your BITSAT score so you can go for any B level course and by securing a good CG in your first year go for a dual degree (once you reach BITS you can get an idea what CG is required for that).

In the end, when you are going to sit for your placement you have the option to sit for both the branches. So finally you get two degrees and you have the option for two jobs in the completely different field.

Hope it helps.

Good Luck!