Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 778 700
2) Placement test : grammar for beginners (anonyme) 5 992 750
3) A/AN (webmaster) 5 365 510
4) Auxiliary BE (webmaster) 3 224 441
5) Present continuous (webmaster) 2 999 400
6) Present simple (webmaster) 2 915 437
7) Present simple (webmaster) 2 597 749
8) Present continuous (webmaster) 2 435 102
9) Adjectives (webmaster) 2 093 700
10) A/an (anonyme) 2 015 523
11) Present perfect simple (webmaster) 1 644 019
12) Preterite (webmaster) 1 628 917
13) Vocabulary - Placement test (bridg) 1 619 309
14) Preterite (webmaster) 1 448 013
15) Short placement test (webmaster) 1 443 660
16) To be (bridg) 1 406 376
17) What time is it? (webmaster) 1 349 519
18) Present perfect (webmaster) 1 346 556
19) The alphabet in English (webmaster) 1 321 211
20) Adjectives (anonyme) 1 216 053
21) What time is it? (webmaster) 1 208 723
22) Numbers (webmaster) 1 188 627
23) 'A' ou 'An' (anonyme) 1 175 687
24) Two presents: present continuous, present simple (webmaster) 1 149 544
25) To be (bridg) 1 145 652
26) Comparatives / Superlatives (webmaster) 1 104 735
27) Numbers (webmaster) 1 070 931
28) CAN / MUST (webmaster) 1 058 760
29) THE/ A / AN / nothing (webmaster) 1 033 884
30) Comparatives (webmaster) 1 007 295
31) Family life (bridg) 1 000 919
32) Numbers > 100 (webmaster) 986 405
33) Future (going to/will/present continuous) (anonyme) 964 223
34) Plural (webmaster) 955 848
35) Superlatives (webmaster) 875 358
36) Adjectives (anonyme) 874 902
37) Simple present (bridg) 854 078
38) Spelled words N°1 (bridg) 850 249
39) Placement test beginners: Check your spelling (anonyme) 830 134
40) Introducing oneself (webmaster) 827 243
41) Adverbs of frequency (anonyme) 817 634
42) Family (bridg) 784 861
43) General test-End of high school / Beginning of university (webmaster) 782 939
44) Present simple (anonyme) 781 011
45) Frequency adverbs (webmaster) 777 839
46) Present BE + Ving (bridg) 765 202
47) Genitive (webmaster) 723 730
48) Passive form (anonyme) 722 852
49) Family tree (anonyme) 719 474
50) Preterite: simple or continuous? (webmaster) 716 843
51) Placement test (beginners) (lili73) 701 209
52) Past simple or present perfect (anonyme) 694 366
53) Future (webmaster) 676 013
54) 2 Preterites (webmaster) 662 164
55) Present perfect simple (bridg) 661 491
56) Preterite (webmaster) 620 576
57) List of 200 irregular verbs and audio (bridg) 616 138
58) Modals (webmaster) 612 762
59) Spelled words N°2 (bridg) 609 256
60) Height (webmaster) 606 356
61) Modals (webmaster) 605 668
62) Articles a / an / the (anonyme) 596 760
63) Plural forms (bridg) 577 562
64) Nationalities (webmaster) 574 329
65) Past continuous / Past simple (anonyme) 566 658
66) Irregular plurals (bridg) 553 707
67) Two presents: simple and continuous (webmaster) 549 728
68) Preterite (bridg) 549 144
69) Superlatives (frapedur) 539 123
70) Vocabulary: greeting people (here4u) 536 470
71) Give your opinion (bridg) 532 045
72) Adverbs of Frequency (bridg) 517 004
73) Present simple or continuous (anonyme) 511 441
74) Present perfect / preterite ? (anonyme) 509 827
75) Possessive case (anonyme) 480 719
76) Countries & nationalities (bridg) 473 563
77) 'The' or nothing? (webmaster) 471 278
78) Past tenses (bridg) 470 956
79) Introducing oneself (easy) (webmaster) 470 758
80) Passive voice (webmaster) 463 564
81) Present Simple vs. Past Simple (anonyme) 457 386
82) Questions : how to ask them (anonyme) 448 501
83) General Test II / End of high school / Beginning of universi (webmaster) 446 196
84) IN, ON, AT or TO? (webmaster) 445 336
85) Relative pronouns (webmaster) 444 597
86) Comparative of superiority (anonyme) 438 788
87) How to pronounce the final -ED? (past simple) (webmaster) 437 965
88) Relative clauses (webmaster) 423 361
89) Sounds: [h] (webmaster) 419 550
90) Comparative (anonyme) 413 755
91) A/an/Ø (bridg) 398 878
92) Past simple (anonyme) 397 500
93) Future simple (anonyme) 396 463
94) This / That / These / Those (webmaster) 392 577
95) Conditional (webmaster) 391 722
96) Passive voice (anonyme) 390 719
97) Comparing (webmaster) 388 056
98) Can / could/ may/ might (woodyrun) 379 536
99) Present perfect or past tense (anonyme) 377 561
100) Much, many, little and few (felin) 372 908
101) Personal pronouns (anonyme) 371 341
102) Preterite continuous (BE + -ING) (webmaster) 369 387
103) Some, any, no, enough, too/too much/too many (webmaster) 368 134
104) Genitive case (bridg) 368 107
105) Confusing words - Placement test (bridg) 364 542
106) Irregular verbs (webmaster) 363 639
107) Numbers from 1 to 10 (anonyme) 361 554
108) Past perfect simple, past perfect continuous (anonyme) 360 932
109) Present continuous or present simple (webmaster) 359 601
110) Present perfect or preterite? (anonyme) 356 990
111) Simple Past : regular verbs (anonyme) 353 171
112) Comparative Adjectives (bridg) 352 262
113) Who, Whom, Which, or Whose? (anonyme) 348 849
114) Past simple (video) (anonyme) 348 496
115) Past simple or past continuous (anonyme) 342 908
116) While / When (anonyme) 338 876
117) What time is it? (webmaster) 337 988
118) Modals (tinou) 336 592
119) Modal: may/might (anonyme) 334 231
120) Cardinal and ordinal numbers (anonyme) 328 760
121) The superlative (anonyme) 325 645
122) Possessive adjectives and pronouns (woodyrun) 324 236
123) How to talk about the weather (lili73) 320 890
124) Since and for (anonyme) 318 895
125) Flags (webmaster) 317 613
126) Irregular verbs (bridg) 316 051
127) Prepositions - in, on, at (anonyme) 314 141
128) Pronouns (woodyrun) 313 731
129) Tenses (anonyme) 311 986
130) Placement test 3 (webmaster) 310 493
131) Order of adjectives (webmaster) 306 600
132) Could/Couldn't (laure95) 305 887
133) Comparative (anonyme) 304 670
134) Agreement Tags (webmaster) 304 060
135) Adjectives and prepositions (anonyme) 304 054
136) Asking questions (webmaster) 303 109
137) Present perfect OR simple past? (bridg) 298 391
138) Questions in the past tense (anonyme) 297 588
139) Superlative Adjectives (bridg) 295 841
140) Uncountable nouns (webmaster) 295 674
141) Object pronouns (bridg) 295 029
142) Placement test 1 (anonyme) 292 814
143) Passive form (anonyme) 291 421
144) Present simple (anonyme) 291 337
145) Can/Must/Should (laure95) 289 426
146) Prefer/rather (bridg) 289 425
147) Past perfect (lili73) 288 320
148) Must or Have to? (woodyrun) 287 564
149) The/an/nothing (bridg) 285 287
150) To be (anonyme) 283 494
151) Can and can't (laure95) 281 650
152) Vocabulary: asking and answering (here4u) 280 444
153) Modal verbs (bridg) 277 299
154) Some / Any / no... (bridg) 270 533
155) Days of the week (bridg) 269 109
156) So / neither (anonyme) 264 367
157) Past simple (video) (anonyme) 263 736
158) Used to (bridg) 260 371
159) Present continuous (chnawa) 260 244
160) Should / must (anonyme) 259 651
161) Past tense (anonyme) 259 330
162) Vocabulary: on the phone (here4u) 258 733
163) Find out a quantity (webmaster) 258 566
164) Superlative + and adjective (anonyme) 257 227
165) Articles : a / an / the / Ø (anonyme) 257 033
166) Comparative and superlative (anonyme) 255 351
167) Numbers 1/100 (anonyme) 253 657
168) Modal can (video) (anonyme) 253 005
169) Comparatives (anonyme) 248 392
170) Relatives pronouns (who, which, that...) (anonyme) 247 846
171) Vocabulary: at the restaurant (here4u) 245 657
172) A few, a little, few, little (anonyme) 245 367
173) Would rather / would prefer to (anonyme) 244 263
174) Present continuous and the Going to form (anonyme) 242 627
175) Should/ have to/ must (anonyme) 240 000
176) Have something done (anonyme) 239 840
177) The past (webmaster) 237 804
178) Used to/would (woodyrun) 237 658
179) Future continuous and future perfect. (felin) 237 615
180) How to ask a question in English (bridg) 235 444
181) I wish, if only (felin) 234 086
182) Pluperfect (webmaster) 233 946
183) Countable or Uncountable? (webmaster) 233 153
184) Some / any (younes91) 232 860
185) Should / shouldn't (anonyme) 231 534
186) Present simple or continuous (bridg) 230 799
187) Adjectives - ing and ed (felin) 229 052
188) Hypothesis (webmaster) 228 129
189) Auxiliary BE (anonyme) 226 443
190) Articles a/an/the/0 (bridg) 226 285
191) Article The or nothing (anonyme) 225 940
192) Must or mustn't (laure95) 225 640
193) Present perfect with Ever - never - (anonyme) 225 521
194) Present continuous OR Present simple? (bridg) 225 418
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 222 826
196) To / in order to / so as to / so that (irish21) 220 201
197) Present perfect (bridg) 219 500
198) Comparison (komiks) 218 819
199) What time is it ? (anonyme) 217 645
200) Indirect speech (bridg) 216 630
