Question

My best subject is Spanish, and I haven't passed a test this month. ........is this correct english grammar true or false​

Answer 1

Change the 'and' to 'but.'

Change 'a test' to 'any tests'

Step-by-step explanation:

You wrote: My best subject is Spanish, and I haven't passed a test this month.

After Changing:

My best subject is Spanish, but I haven't passed any tests this month.

If you change it, it sounds more like you are unhappy about your Spanish skills and makes more sense.