Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 778 421
2) Placement test : grammar for beginners (anonyme) 5 992 059
3) A/AN (webmaster) 5 365 176
4) Auxiliary BE (webmaster) 3 224 299
5) Present continuous (webmaster) 2 999 212
6) Present simple (webmaster) 2 914 819
7) Present simple (webmaster) 2 597 549
8) Present continuous (webmaster) 2 434 674
9) Adjectives (webmaster) 2 093 603
10) A/an (anonyme) 2 015 363
11) Present perfect simple (webmaster) 1 643 708
12) Preterite (webmaster) 1 628 475
13) Vocabulary - Placement test (bridg) 1 619 186
14) Preterite (webmaster) 1 447 700
15) Short placement test (webmaster) 1 443 575
16) To be (bridg) 1 406 244
17) What time is it? (webmaster) 1 349 379
18) Present perfect (webmaster) 1 346 251
19) The alphabet in English (webmaster) 1 321 126
20) Adjectives (anonyme) 1 215 919
21) What time is it? (webmaster) 1 208 484
22) Numbers (webmaster) 1 188 576
23) 'A' ou 'An' (anonyme) 1 175 564
24) Two presents: present continuous, present simple (webmaster) 1 149 415
25) To be (bridg) 1 145 587
26) Comparatives / Superlatives (webmaster) 1 104 434
27) Numbers (webmaster) 1 070 818
28) CAN / MUST (webmaster) 1 058 689
29) THE/ A / AN / nothing (webmaster) 1 033 735
30) Comparatives (webmaster) 1 007 229
31) Family life (bridg) 1 000 843
32) Numbers > 100 (webmaster) 986 331
33) Future (going to/will/present continuous) (anonyme) 964 093
34) Plural (webmaster) 955 765
35) Superlatives (webmaster) 875 290
36) Adjectives (anonyme) 874 811
37) Simple present (bridg) 854 003
38) Spelled words N°1 (bridg) 850 197
39) Placement test beginners: Check your spelling (anonyme) 830 089
40) Introducing oneself (webmaster) 827 205
41) Adverbs of frequency (anonyme) 817 545
42) Family (bridg) 784 806
43) General test-End of high school / Beginning of university (webmaster) 782 888
44) Present simple (anonyme) 780 646
45) Frequency adverbs (webmaster) 777 786
46) Present BE + Ving (bridg) 765 137
47) Genitive (webmaster) 723 675
48) Passive form (anonyme) 722 384
49) Family tree (anonyme) 719 421
50) Preterite: simple or continuous? (webmaster) 716 728
51) Placement test (beginners) (lili73) 701 134
52) Past simple or present perfect (anonyme) 694 199
53) Future (webmaster) 675 961
54) 2 Preterites (webmaster) 662 084
55) Present perfect simple (bridg) 661 273
56) Preterite (webmaster) 620 463
57) List of 200 irregular verbs and audio (bridg) 616 070
58) Modals (webmaster) 612 717
59) Spelled words N°2 (bridg) 609 212
60) Height (webmaster) 606 326
61) Modals (webmaster) 605 542
62) Articles a / an / the (anonyme) 596 759
63) Plural forms (bridg) 577 493
64) Nationalities (webmaster) 574 282
65) Past continuous / Past simple (anonyme) 566 485
66) Irregular plurals (bridg) 553 640
67) Two presents: simple and continuous (webmaster) 549 639
68) Preterite (bridg) 549 066
69) Superlatives (frapedur) 538 964
70) Vocabulary: greeting people (here4u) 536 466
71) Give your opinion (bridg) 531 970
72) Adverbs of Frequency (bridg) 516 970
73) Present simple or continuous (anonyme) 511 158
74) Present perfect / preterite ? (anonyme) 509 666
75) Possessive case (anonyme) 480 660
76) Countries & nationalities (bridg) 473 500
77) 'The' or nothing? (webmaster) 471 245
78) Past tenses (bridg) 470 868
79) Introducing oneself (easy) (webmaster) 470 736
80) Passive voice (webmaster) 463 485
81) Present Simple vs. Past Simple (anonyme) 457 267
82) Questions : how to ask them (anonyme) 448 417
83) General Test II / End of high school / Beginning of universi (webmaster) 446 172
84) IN, ON, AT or TO? (webmaster) 445 249
85) Relative pronouns (webmaster) 444 476
86) Comparative of superiority (anonyme) 438 685
87) How to pronounce the final -ED? (past simple) (webmaster) 437 832
88) Relative clauses (webmaster) 423 291
89) Sounds: [h] (webmaster) 419 518
90) Comparative (anonyme) 413 700
91) A/an/Ø (bridg) 398 827
92) Past simple (anonyme) 397 324
93) Future simple (anonyme) 396 408
94) This / That / These / Those (webmaster) 392 542
95) Conditional (webmaster) 391 666
96) Passive voice (anonyme) 390 620
97) Comparing (webmaster) 388 030
98) Can / could/ may/ might (woodyrun) 379 503
99) Present perfect or past tense (anonyme) 377 481
100) Much, many, little and few (felin) 372 819
101) Personal pronouns (anonyme) 371 293
102) Preterite continuous (BE + -ING) (webmaster) 369 275
103) Some, any, no, enough, too/too much/too many (webmaster) 368 102
104) Genitive case (bridg) 368 074
105) Confusing words - Placement test (bridg) 364 532
106) Irregular verbs (webmaster) 363 595
107) Numbers from 1 to 10 (anonyme) 361 530
108) Past perfect simple, past perfect continuous (anonyme) 360 910
109) Present continuous or present simple (webmaster) 359 570
110) Present perfect or preterite? (anonyme) 356 832
111) Simple Past : regular verbs (anonyme) 353 066
112) Comparative Adjectives (bridg) 352 233
113) Who, Whom, Which, or Whose? (anonyme) 348 813
114) Past simple (video) (anonyme) 348 371
115) Past simple or past continuous (anonyme) 342 727
116) While / When (anonyme) 338 805
117) What time is it? (webmaster) 337 883
118) Modals (tinou) 336 557
119) Modal: may/might (anonyme) 334 217
120) Cardinal and ordinal numbers (anonyme) 328 730
121) The superlative (anonyme) 325 552
122) Possessive adjectives and pronouns (woodyrun) 324 209
123) How to talk about the weather (lili73) 320 885
124) Since and for (anonyme) 318 846
125) Flags (webmaster) 317 589
126) Irregular verbs (bridg) 316 007
127) Prepositions - in, on, at (anonyme) 314 121
128) Pronouns (woodyrun) 313 664
129) Tenses (anonyme) 311 940
130) Placement test 3 (webmaster) 310 452
131) Order of adjectives (webmaster) 306 571
132) Could/Couldn't (laure95) 305 846
133) Comparative (anonyme) 304 597
134) Adjectives and prepositions (anonyme) 304 029
135) Agreement Tags (webmaster) 304 028
136) Asking questions (webmaster) 303 096
137) Present perfect OR simple past? (bridg) 298 363
138) Questions in the past tense (anonyme) 297 557
139) Superlative Adjectives (bridg) 295 808
140) Uncountable nouns (webmaster) 295 633
141) Object pronouns (bridg) 294 944
142) Placement test 1 (anonyme) 292 790
143) Passive form (anonyme) 291 260
144) Present simple (anonyme) 291 251
145) Prefer/rather (bridg) 289 380
146) Can/Must/Should (laure95) 289 316
147) Past perfect (lili73) 288 184
148) Must or Have to? (woodyrun) 287 498
149) The/an/nothing (bridg) 285 233
150) To be (anonyme) 283 479
151) Can and can't (laure95) 281 567
152) Vocabulary: asking and answering (here4u) 280 442
153) Modal verbs (bridg) 277 260
154) Some / Any / no... (bridg) 270 474
155) Days of the week (bridg) 269 105
156) So / neither (anonyme) 264 361
157) Past simple (video) (anonyme) 263 713
158) Used to (bridg) 260 364
159) Present continuous (chnawa) 260 088
160) Should / must (anonyme) 259 551
161) Past tense (anonyme) 259 305
162) Vocabulary: on the phone (here4u) 258 729
163) Find out a quantity (webmaster) 258 545
164) Superlative + and adjective (anonyme) 257 193
165) Articles : a / an / the / Ø (anonyme) 256 923
166) Comparative and superlative (anonyme) 255 266
167) Numbers 1/100 (anonyme) 253 640
168) Modal can (video) (anonyme) 252 982
169) Comparatives (anonyme) 248 246
170) Relatives pronouns (who, which, that...) (anonyme) 247 839
171) Vocabulary: at the restaurant (here4u) 245 654
172) A few, a little, few, little (anonyme) 245 285
173) Would rather / would prefer to (anonyme) 244 243
174) Present continuous and the Going to form (anonyme) 242 596
175) Should/ have to/ must (anonyme) 239 969
176) Have something done (anonyme) 239 820
177) The past (webmaster) 237 790
178) Used to/would (woodyrun) 237 609
179) Future continuous and future perfect. (felin) 237 603
180) How to ask a question in English (bridg) 235 414
181) I wish, if only (felin) 234 072
182) Pluperfect (webmaster) 233 918
183) Countable or Uncountable? (webmaster) 233 133
184) Some / any (younes91) 232 798
185) Should / shouldn't (anonyme) 231 485
186) Present simple or continuous (bridg) 230 799
187) Adjectives - ing and ed (felin) 229 020
188) Hypothesis (webmaster) 228 109
189) Auxiliary BE (anonyme) 226 421
190) Articles a/an/the/0 (bridg) 226 273
191) Article The or nothing (anonyme) 225 919
192) Must or mustn't (laure95) 225 570
193) Present perfect with Ever - never - (anonyme) 225 515
194) Present continuous OR Present simple? (bridg) 225 363
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 222 811
196) To / in order to / so as to / so that (irish21) 220 155
197) Present perfect (bridg) 219 485
198) Comparison (komiks) 218 695
199) What time is it ? (anonyme) 217 638
200) Indirect speech (bridg) 216 578
