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How "abnormal" is the last question of the college entrance examination mathematics?

I took the college entrance examination. Let's talk about it based on my actual experience. Mathematics this year is generally more difficult than in previous years. First of all, the fill-in-the-blank questions are more difficult than before, and the last four questions are not simple, among which 1 1 and 12 are hard to think of and easy to calculate; 13 and 14 are difficult to calculate. Question (3) of short answer 18 is difficult to calculate and make it tense, but we can find the fixed point by special value method first, and then prove it, and we can get most of the scores. 19 is moderately south, so we must find the relationship between the first term and tolerance through the first three terms, and then find Sn by superposition method. . . . You can try the first two questions of 20 questions, and you must give up the third question. It is difficult to attach the last question, because it is proof, and usually these questions are rarely touched. There are many innovative questions this year, killing 520,000 Jiangsu candidates, most of whom are in southern Jiangsu.