2. It doesn't matter if you don't contact. Learn what you are talking about first, don't get deeper and deeper, and be led by knowledge;
When learning new knowledge, you will use what you left behind. At this time, you have to make up for this urgently needed part. Don't worry, make up for it while using it. This is not only efficient, but also easy to understand and use.
4. When you are free, make up the rest;
Don't lose heart, cheer up, it's nothing. I came here in the same way. The above is what my seniors taught me, and I learned English well by it (I didn't get 40 in primary school English, but I got 108 in the senior high school entrance examination. What do you think? Students, have confidence and work hard! ! ! Wish you success! ! !