I deleted my Ubuntu partition cause I wanted to install Linux mint. But now when I switch on my laptop, I'm unable to boot into Windows. I'm getting a grub terminal (not sure if it's grub rescue mode) on startup. It says: Gnu grub version 2.02^beta2-9ubuntu1.3 Minimal bash like line editing is supported For the first word, tab lists possible command completions. Anywhere else tab lists possible device or file completions . grub>
I've encountered that same issue before. You have to run
update-grub once you delete a partition, but I didn't so grub didn't know about the changes to the disk. I follow the tutorial How to Rescue a Non-booting GRUB 2 on Linux, but in your case if you want to boot into Windows, what specific settings are necessary there.
I'd suggest the easier way - go to friends with a PC, create Linux Mint installation USB, and install Mint. The installer should detect Windows partition, and let you choose to install along-side Windows.