Sneha

In simple words, I would like to answer this question by only explaining one point.

It's a rule in standard GB English.

That any word which has a consonant after R, or nothing after R, there will be a stress on the syllable before R and R are silent while pronouncing, e.g., sir, tart, mart, superb, bird etc.

Whereas if any word has a vowel after R then only we pronounce R  in that word. For, e.g., rat, care, rope, rice etc. Also, there is a difference in pronunciation due to rhotic and non-rhotic English. Generally, all the speakers from countries like India, Canada, Pakistan, US etc. are rhotic and thus pronounce R in their speech. Rhotic is used at the mass level if we learn English as our 2nd language. But If we want to learn standard  GB English, then we need to look for this non-rhotic rule.

I feel first of all; scoring should not be our motto of education. Instead, we should emphasize on learning. Remember, there is a difference in being literate and educated. So, in the long run, it's our education that matters. If we understand anything properly then definitely nobody can take it from us.

Now coming to your second point about online classes, in these COVID times, it is essential to maintain regularity and punctuality. So if you want to learn, then online courses are the best way to study because here on this platform you get ample options to select teacher according to your requirement and suitability. Therefore you become more comfortable with the teacher of your choice. Here you are the decision-maker.

If you want to develop your skill, the golden rule to this is-observe and practice, no matter whatever skill you want to acquire, first you need to observe such people who have it and then try adapting them in your own life. That is how you master any skill, be it communication, professional or creative. Any kind of education or learning is successful only when we can relate it to our day to day life, that too, with a good mentor on our side if need be.